diff --git a/.github/workflows/artifacts-build.yml b/.github/workflows/artifacts-build.yml
index f588264cdfb..4a5a0e76113 100644
--- a/.github/workflows/artifacts-build.yml
+++ b/.github/workflows/artifacts-build.yml
@@ -572,70 +572,6 @@ jobs:
           git checkout empty
           gsutil -m cp -r benchmarks/binsize/* gs://${{ env.GCP_MAIN_BUCKET_ID }}/gha/benchmarks/binsize
 
-  # Data size benchmark: track size of provider/datagen/tests/data/testdata.postcard (total data size).
-  bench-datasize:
-    # This is too expensive to run on every push, so only run it on main.
-    # When running on a PR, comment this out and set the BASELINE variable below to the baseline commit.
-    if: github.ref == 'refs/heads/main' && github.repository == 'unicode-org/icu4x'
-    concurrency:
-      # Allow one run at a time to include the previous run's results
-      group: bench-datasize
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-
-    # GCP Boilerplate for jobs in main repository
-    - id: gcp-auth
-      name: "Authenticate to Google Cloud with Workload Identity Provider"
-      uses: google-github-actions/auth@v1
-      with:
-        workload_identity_provider: "projects/66042061814/locations/global/workloadIdentityPools/icu4x-gha-pool1/providers/icu4x-gha-provider1"
-        service_account: "icu4x-main@dev-infra-273822.iam.gserviceaccount.com"
-    - name: "Set up Google Cloud SDK"
-      uses: google-github-actions/setup-gcloud@v1
-
-    - name: Install rustfmt
-      run: |
-        rustup component add rustfmt
-
-    - name: Setup output data directory
-      run: |
-        mkdir -p benchmarks/datasize
-
-    - name: Generate testdata
-      run: |
-        cargo run --bin make-testdata-legacy --manifest-path tools/testdata-scripts/Cargo.toml
-
-    - name: Measure size of selected data package provider/testdata/data/testdata.postcard
-      run: |
-        cargo run --package icu_benchmark_binsize  -- provider/testdata/data/testdata.postcard file | tee benchmarks/datasize/output.txt
-
-    - name:  Download previous benchmark data
-      run: |
-        mkdir -p benchmarks
-        gsutil -m cp -rn gs://${{ env.GCP_MAIN_BUCKET_ID }}/gha/benchmarks/datasize/* benchmarks/datasize
-
-    - name: Store benchmark result & create dashboard
-      # Use gregtatum special feature to process ndjson-formatted benchmark data
-      uses: gregtatum/github-action-benchmark@d3f06f738e9612988d575db23fae5ca0008d3d12
-      with:
-        tool: 'ndjson'
-        output-file-path: benchmarks/datasize/output.txt
-        benchmark-data-dir-path: ./benchmarks/datasize
-        # Tentative setting, optimized value to be determined
-        alert-threshold: '100%'
-        fail-on-alert: false
-        # comment-on-alert: true
-        github-token: ${{ secrets.GITHUB_TOKEN }}
-        gh-pages-branch: empty
-        # alert-comment-cc-users: '@gnrunge,@sffc,@zbraniecki,@echeran'
-
-    - name: Upload new benchmark data
-      if: success() || failure()
-      run: |
-          git checkout empty
-          gsutil -m cp -r benchmarks/datasize/* gs://${{ env.GCP_MAIN_BUCKET_ID }}/gha/benchmarks/datasize
-
   gh-pages:
     name: "Deploy to GitHub Pages"
     needs: [rust-docs, cpp-docs, ts-docs, dart-docs, wasm-demo, bench-perf, bench-memory, bench-datasize] # bench-binsize
diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index 61b48fdc031..defb0f54aa6 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -196,35 +196,6 @@ jobs:
     - name: Run `cargo make ci-job-testdata`
       run: cargo make ci-job-testdata
 
-
-  # ci-job-testdata-legacy
-  testdata-legacy:
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v4
-
-    # Cargo-make boilerplate
-    - name: Install cargo-make
-      uses: taiki-e/install-action@cargo-make
-
-    # Toolchain boilerplate
-    - name: Potentially override rust version with nightly
-      run: cargo make set-ci-toolchain
-    - name: Show the selected Rust toolchain
-      run: rustup show
-
-    # Job-specific dependencies
-    - name: Install cargo-binstall 
-      uses: taiki-e/install-action@cargo-binstall
-    - name: Install cargo-all-features
-      run: cargo-binstall -y cargo-all-features
-
-    # Actual job
-    - name: Run `cargo make ci-job-testdata-legacy`
-      run: cargo make ci-job-testdata-legacy
-
-
   # ci-job-full-datagen
   full-datagen:
     runs-on: ubuntu-latest
@@ -561,7 +532,7 @@ jobs:
 
   # Notify on slack  
   notify-slack:
-    needs: [msrv, test, testdata, testdata-legacy, test-docs, full-datagen, test-c, test-js, test-dart, nostd, diplomat, gn, fmt, tidy, clippy, doc]
+    needs: [msrv, test, testdata, test-docs, full-datagen, test-c, test-js, test-dart, nostd, diplomat, gn, fmt, tidy, clippy, doc]
     if: ${{ always() && contains(needs.*.result, 'failure') && (github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' || (github.event_name == 'push' && github.ref_name == 'main')) }}
     runs-on: ubuntu-latest
     steps:
diff --git a/Cargo.lock b/Cargo.lock
index deead13b7e9..a53f8c498fa 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1558,13 +1558,11 @@ version = "0.0.0"
 dependencies = [
  "clap",
  "crlify",
- "databake",
  "eyre",
  "icu_datagen",
  "icu_locid",
  "icu_provider",
  "log",
- "quote",
  "simple_logger",
  "ureq",
  "zip",
diff --git a/Cargo.toml b/Cargo.toml
index 76bd66e9cdc..e875ac9e7ac 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -92,11 +92,6 @@ members = [
 # Note: Workspaces in subdirectories, such as tutorials/crates, are
 # implicitly excluded from the main workspace.
 exclude = [
-    # Testdata will still be published in the 1.x stream, but is deprecated
-    # and we don't use it anymore. As we don't want to keep the actual data
-    # in the repo it doesn't build without running `cargo make testdata-legacy`
-    # first.
-    "provider/testdata",
     # Tutorials are tested outside the workspace to simulate external users
     "tutorials",
 ]
diff --git a/Makefile.toml b/Makefile.toml
index 9c89ac2f2a1..fe821f9863c 100644
--- a/Makefile.toml
+++ b/Makefile.toml
@@ -97,14 +97,6 @@ dependencies = [
     "testdata-check",
 ]
 
-[tasks.ci-job-testdata-legacy]
-description = "Run all tests for the CI 'testdata' job"
-category = "CI"
-dependencies = [
-    "testdata-legacy",
-    "testdata-legacy-test",
-]
-
 [tasks.ci-job-test-docs]
 description = "Run all tests for the CI 'test-docs' job"
 category = "CI"
diff --git a/provider/testdata/.gitignore b/provider/testdata/.gitignore
deleted file mode 100644
index 6320cd248dd..00000000000
--- a/provider/testdata/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-data
\ No newline at end of file
diff --git a/provider/testdata/Cargo.lock b/provider/testdata/Cargo.lock
deleted file mode 100644
index bceeee86f68..00000000000
--- a/provider/testdata/Cargo.lock
+++ /dev/null
@@ -1,1196 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "aho-corasick"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "43f6cb1bf222025340178f382c426f13757b2960e89779dfcb319c32542a5a41"
-dependencies = [
- "memchr",
-]
-
-[[package]]
-name = "anes"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"
-
-[[package]]
-name = "anstyle"
-version = "1.0.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8901269c6307e8d93993578286ac0edf7f195079ffff5ebdeea6a59ffb7e36bc"
-
-[[package]]
-name = "autocfg"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
-
-[[package]]
-name = "bumpalo"
-version = "3.13.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
-
-[[package]]
-name = "calendrical_calculations"
-version = "0.1.1"
-dependencies = [
- "core_maths",
- "displaydoc",
-]
-
-[[package]]
-name = "cast"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37b2a672a2cb129a2e41c10b1224bb368f9f37a2b16b612598138befd7b37eb5"
-
-[[package]]
-name = "cfg-if"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
-
-[[package]]
-name = "ciborium"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "effd91f6c78e5a4ace8a5d3c0b6bfaec9e2baaef55f3efc00e45fb2e477ee926"
-dependencies = [
- "ciborium-io",
- "ciborium-ll",
- "serde",
-]
-
-[[package]]
-name = "ciborium-io"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cdf919175532b369853f5d5e20b26b43112613fd6fe7aee757e35f7a44642656"
-
-[[package]]
-name = "ciborium-ll"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "defaa24ecc093c77630e6c15e17c51f5e187bf35ee514f4e2d67baaa96dae22b"
-dependencies = [
- "ciborium-io",
- "half",
-]
-
-[[package]]
-name = "clap"
-version = "4.5.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bc066a67923782aa8515dbaea16946c5bcc5addbd668bb80af688e53e548a0"
-dependencies = [
- "clap_builder",
-]
-
-[[package]]
-name = "clap_builder"
-version = "4.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae129e2e766ae0ec03484e609954119f123cc1fe650337e155d03b022f24f7b4"
-dependencies = [
- "anstyle",
- "clap_lex",
-]
-
-[[package]]
-name = "clap_lex"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "98cc8fbded0c607b7ba9dd60cd98df59af97e84d24e49c8557331cfc26d301ce"
-
-[[package]]
-name = "cobs"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67ba02a97a2bd10f4b59b25c7973101c79642302776489e030cd13cdab09ed15"
-
-[[package]]
-name = "core_maths"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3b02505ccb8c50b0aa21ace0fc08c3e53adebd4e58caa18a36152803c7709a3"
-dependencies = [
- "libm",
-]
-
-[[package]]
-name = "criterion"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2b12d017a929603d80db1831cd3a24082f8137ce19c69e6447f54f5fc8d692f"
-dependencies = [
- "anes",
- "cast",
- "ciborium",
- "clap",
- "criterion-plot",
- "is-terminal",
- "itertools",
- "num-traits",
- "once_cell",
- "oorandom",
- "plotters",
- "rayon",
- "regex",
- "serde",
- "serde_derive",
- "serde_json",
- "tinytemplate",
- "walkdir",
-]
-
-[[package]]
-name = "criterion-plot"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b50826342786a51a89e2da3a28f1c32b06e387201bc2d19791f622c673706b1"
-dependencies = [
- "cast",
- "itertools",
-]
-
-[[package]]
-name = "crossbeam-channel"
-version = "0.5.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a33c2bf77f2df06183c3aa30d1e96c0695a313d4f9c453cc3762a6db39f99200"
-dependencies = [
- "cfg-if",
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-deque"
-version = "0.8.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce6fd6f855243022dcecf8702fef0c297d4338e226845fe067f6341ad9fa0cef"
-dependencies = [
- "cfg-if",
- "crossbeam-epoch",
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-epoch"
-version = "0.9.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae211234986c545741a7dc064309f67ee1e5ad243d0e48335adc0484d960bcc7"
-dependencies = [
- "autocfg",
- "cfg-if",
- "crossbeam-utils",
- "memoffset",
- "scopeguard",
-]
-
-[[package]]
-name = "crossbeam-utils"
-version = "0.8.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a22b2d63d4d1dc0b7f1b6b2747dd0088008a9be28b6ddf0b1e7d335e3037294"
-dependencies = [
- "cfg-if",
-]
-
-[[package]]
-name = "displaydoc"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "487585f4d0c6655fe74905e2504d8ad6908e4db67f744eb140876906c2f3175d"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "either"
-version = "1.12.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3dca9240753cf90908d7e4aac30f630662b02aebaa1b58a3cadabdb23385b58b"
-
-[[package]]
-name = "fixed_decimal"
-version = "0.5.6"
-dependencies = [
- "displaydoc",
- "smallvec",
- "writeable",
-]
-
-[[package]]
-name = "half"
-version = "1.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
-
-[[package]]
-name = "hermit-abi"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
-
-[[package]]
-name = "icu"
-version = "1.5.0"
-dependencies = [
- "icu_calendar",
- "icu_casemap",
- "icu_collator",
- "icu_collections",
- "icu_datetime",
- "icu_decimal",
- "icu_list",
- "icu_locid",
- "icu_locid_transform",
- "icu_normalizer",
- "icu_plurals",
- "icu_properties",
- "icu_provider",
- "icu_segmenter",
- "icu_timezone",
-]
-
-[[package]]
-name = "icu_calendar"
-version = "1.5.0"
-dependencies = [
- "calendrical_calculations",
- "displaydoc",
- "icu_locid",
- "icu_provider",
- "tinystr",
- "writeable",
- "zerovec",
-]
-
-[[package]]
-name = "icu_casemap"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "icu_collections",
- "icu_locid",
- "icu_properties",
- "icu_provider",
- "writeable",
- "zerovec",
-]
-
-[[package]]
-name = "icu_collator"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "icu_collections",
- "icu_normalizer",
- "icu_properties",
- "icu_provider",
- "smallvec",
- "utf16_iter",
- "utf8_iter",
- "zerovec",
-]
-
-[[package]]
-name = "icu_collections"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "yoke",
- "zerofrom",
- "zerovec",
-]
-
-[[package]]
-name = "icu_datetime"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "either",
- "fixed_decimal",
- "icu_calendar",
- "icu_decimal",
- "icu_locid",
- "icu_plurals",
- "icu_provider",
- "icu_timezone",
- "litemap",
- "smallvec",
- "tinystr",
- "writeable",
- "zerovec",
-]
-
-[[package]]
-name = "icu_decimal"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "fixed_decimal",
- "icu_provider",
- "writeable",
-]
-
-[[package]]
-name = "icu_experimental"
-version = "0.1.0"
-dependencies = [
- "displaydoc",
- "fixed_decimal",
- "icu_collections",
- "icu_decimal",
- "icu_locid",
- "icu_locid_transform",
- "icu_normalizer",
- "icu_pattern",
- "icu_plurals",
- "icu_properties",
- "icu_provider",
- "litemap",
- "num-bigint",
- "num-rational",
- "num-traits",
- "smallvec",
- "tinystr",
- "writeable",
- "zerofrom",
- "zerotrie",
- "zerovec",
-]
-
-[[package]]
-name = "icu_list"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "icu_provider",
- "regex-automata 0.2.0",
- "writeable",
-]
-
-[[package]]
-name = "icu_locid"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "litemap",
- "serde",
- "tinystr",
- "writeable",
- "zerovec",
-]
-
-[[package]]
-name = "icu_locid_transform"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "icu_locid",
- "icu_provider",
- "serde",
- "tinystr",
- "zerovec",
-]
-
-[[package]]
-name = "icu_normalizer"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "icu_collections",
- "icu_properties",
- "icu_provider",
- "smallvec",
- "utf16_iter",
- "utf8_iter",
- "write16",
- "zerovec",
-]
-
-[[package]]
-name = "icu_pattern"
-version = "0.1.0"
-dependencies = [
- "displaydoc",
- "either",
- "writeable",
- "yoke",
- "zerofrom",
-]
-
-[[package]]
-name = "icu_plurals"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "fixed_decimal",
- "icu_provider",
- "zerovec",
-]
-
-[[package]]
-name = "icu_properties"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "icu_collections",
- "icu_provider",
- "tinystr",
- "zerovec",
-]
-
-[[package]]
-name = "icu_provider"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "icu_locid",
- "icu_provider_macros",
- "postcard",
- "serde",
- "stable_deref_trait",
- "tinystr",
- "writeable",
- "yoke",
- "zerofrom",
- "zerovec",
-]
-
-[[package]]
-name = "icu_provider_adapters"
-version = "1.5.0"
-dependencies = [
- "icu_locid",
- "icu_locid_transform",
- "icu_provider",
- "serde",
- "tinystr",
- "zerovec",
-]
-
-[[package]]
-name = "icu_provider_blob"
-version = "1.5.0"
-dependencies = [
- "icu_provider",
- "postcard",
- "serde",
- "writeable",
- "zerotrie",
- "zerovec",
-]
-
-[[package]]
-name = "icu_provider_macros"
-version = "1.5.0"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "icu_segmenter"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "icu_collections",
- "icu_locid",
- "icu_provider",
- "utf8_iter",
- "zerovec",
-]
-
-[[package]]
-name = "icu_testdata"
-version = "1.5.0"
-dependencies = [
- "criterion",
- "icu",
- "icu_calendar",
- "icu_casemap",
- "icu_collator",
- "icu_collections",
- "icu_datetime",
- "icu_decimal",
- "icu_experimental",
- "icu_list",
- "icu_locid",
- "icu_locid_transform",
- "icu_normalizer",
- "icu_pattern",
- "icu_plurals",
- "icu_properties",
- "icu_provider",
- "icu_provider_adapters",
- "icu_provider_blob",
- "icu_segmenter",
- "icu_timezone",
- "zerotrie",
- "zerovec",
-]
-
-[[package]]
-name = "icu_timezone"
-version = "1.5.0"
-dependencies = [
- "displaydoc",
- "icu_calendar",
- "icu_provider",
- "tinystr",
- "zerotrie",
- "zerovec",
-]
-
-[[package]]
-name = "is-terminal"
-version = "0.4.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f23ff5ef2b80d608d61efee834934d862cd92461afc0560dedf493e4c033738b"
-dependencies = [
- "hermit-abi",
- "libc",
- "windows-sys",
-]
-
-[[package]]
-name = "itertools"
-version = "0.10.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
-dependencies = [
- "either",
-]
-
-[[package]]
-name = "itoa"
-version = "1.0.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62b02a5381cc465bd3041d84623d0fa3b66738b52b8e2fc3bab8ad63ab032f4a"
-
-[[package]]
-name = "js-sys"
-version = "0.3.64"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c5f195fe497f702db0f318b07fdd68edb16955aed830df8363d837542f8f935a"
-dependencies = [
- "wasm-bindgen",
-]
-
-[[package]]
-name = "libc"
-version = "0.2.147"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
-
-[[package]]
-name = "libm"
-version = "0.2.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f7012b1bbb0719e1097c47611d3898568c546d597c2e74d66f6087edd5233ff4"
-
-[[package]]
-name = "litemap"
-version = "0.7.3"
-dependencies = [
- "serde",
-]
-
-[[package]]
-name = "log"
-version = "0.4.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b06a4cde4c0f271a446782e3eff8de789548ce57dbc8eca9292c27f4a42004b4"
-
-[[package]]
-name = "memchr"
-version = "2.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
-
-[[package]]
-name = "memoffset"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a634b1c61a95585bd15607c6ab0c4e5b226e695ff2800ba0cdccddf208c406c"
-dependencies = [
- "autocfg",
-]
-
-[[package]]
-name = "num-bigint"
-version = "0.4.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "608e7659b5c3d7cba262d894801b9ec9d00de989e8a82bd4bef91d08da45cdc0"
-dependencies = [
- "autocfg",
- "num-integer",
- "num-traits",
-]
-
-[[package]]
-name = "num-integer"
-version = "0.1.46"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7969661fd2958a5cb096e56c8e1ad0444ac2bbcd0061bd28660485a44879858f"
-dependencies = [
- "num-traits",
-]
-
-[[package]]
-name = "num-rational"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0638a1c9d0a3c0914158145bc76cff373a75a627e6ecbfb71cbe6f453a5a19b0"
-dependencies = [
- "autocfg",
- "num-bigint",
- "num-integer",
- "num-traits",
-]
-
-[[package]]
-name = "num-traits"
-version = "0.2.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da0df0e5185db44f69b44f26786fe401b6c293d1907744beaa7fa62b2e5a517a"
-dependencies = [
- "autocfg",
-]
-
-[[package]]
-name = "num_cpus"
-version = "1.16.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
-dependencies = [
- "hermit-abi",
- "libc",
-]
-
-[[package]]
-name = "once_cell"
-version = "1.18.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
-
-[[package]]
-name = "oorandom"
-version = "11.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ab1bc2a289d34bd04a330323ac98a1b4bc82c9d9fcb1e66b63caa84da26b575"
-
-[[package]]
-name = "plotters"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2c224ba00d7cadd4d5c660deaf2098e5e80e07846537c51f9cfa4be50c1fd45"
-dependencies = [
- "num-traits",
- "plotters-backend",
- "plotters-svg",
- "wasm-bindgen",
- "web-sys",
-]
-
-[[package]]
-name = "plotters-backend"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e76628b4d3a7581389a35d5b6e2139607ad7c75b17aed325f210aa91f4a9609"
-
-[[package]]
-name = "plotters-svg"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38f6d39893cca0701371e3c27294f09797214b86f1fb951b89ade8ec04e2abab"
-dependencies = [
- "plotters-backend",
-]
-
-[[package]]
-name = "postcard"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cfa512cd0d087cc9f99ad30a1bf64795b67871edbead083ffc3a4dfafa59aa00"
-dependencies = [
- "cobs",
- "serde",
-]
-
-[[package]]
-name = "proc-macro2"
-version = "1.0.63"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b368fba921b0dce7e60f5e04ec15e565b3303972b42bcfde1d0713b881959eb"
-dependencies = [
- "unicode-ident",
-]
-
-[[package]]
-name = "quote"
-version = "1.0.29"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "573015e8ab27661678357f27dc26460738fd2b6c86e46f386fde94cb5d913105"
-dependencies = [
- "proc-macro2",
-]
-
-[[package]]
-name = "rayon"
-version = "1.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d2df5196e37bcc87abebc0053e20787d73847bb33134a69841207dd0a47f03b"
-dependencies = [
- "either",
- "rayon-core",
-]
-
-[[package]]
-name = "rayon-core"
-version = "1.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b8f95bd6966f5c87776639160a66bd8ab9895d9d4ab01ddba9fc60661aebe8d"
-dependencies = [
- "crossbeam-channel",
- "crossbeam-deque",
- "crossbeam-utils",
- "num_cpus",
-]
-
-[[package]]
-name = "regex"
-version = "1.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89089e897c013b3deb627116ae56a6955a72b8bed395c9526af31c9fe528b484"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-automata 0.3.0",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-automata"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e9368763f5a9b804326f3af749e16f9abf378d227bcdee7634b13d8f17793782"
-dependencies = [
- "memchr",
-]
-
-[[package]]
-name = "regex-automata"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa250384981ea14565685dea16a9ccc4d1c541a13f82b9c168572264d1df8c56"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-syntax"
-version = "0.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2ab07dc67230e4a4718e70fd5c20055a4334b121f1f9db8fe63ef39ce9b8c846"
-
-[[package]]
-name = "ryu"
-version = "1.0.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe232bdf6be8c8de797b22184ee71118d63780ea42ac85b61d1baa6d3b782ae9"
-
-[[package]]
-name = "same-file"
-version = "1.0.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
-dependencies = [
- "winapi-util",
-]
-
-[[package]]
-name = "scopeguard"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
-
-[[package]]
-name = "serde"
-version = "1.0.166"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d01b7404f9d441d3ad40e6a636a7782c377d2abdbe4fa2440e2edcc2f4f10db8"
-dependencies = [
- "serde_derive",
-]
-
-[[package]]
-name = "serde_derive"
-version = "1.0.166"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5dd83d6dde2b6b2d466e14d9d1acce8816dedee94f735eac6395808b3483c6d6"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "serde_json"
-version = "1.0.100"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f1e14e89be7aa4c4b78bdbdc9eb5bf8517829a600ae8eaa39a6e1d960b5185c"
-dependencies = [
- "itoa",
- "ryu",
- "serde",
-]
-
-[[package]]
-name = "smallvec"
-version = "1.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6ecd384b10a64542d77071bd64bd7b231f4ed5940fba55e98c3de13824cf3d7"
-
-[[package]]
-name = "stable_deref_trait"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
-
-[[package]]
-name = "syn"
-version = "2.0.23"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59fb7d6d8281a51045d62b8eb3a7d1ce347b76f312af50cd3dc0af39c87c1737"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
-[[package]]
-name = "synstructure"
-version = "0.13.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "285ba80e733fac80aa4270fbcdf83772a79b80aa35c97075320abfee4a915b06"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "unicode-xid",
-]
-
-[[package]]
-name = "tinystr"
-version = "0.7.6"
-dependencies = [
- "displaydoc",
- "serde",
- "zerovec",
-]
-
-[[package]]
-name = "tinytemplate"
-version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be4d6b5f19ff7664e8c98d03e2139cb510db9b0a60b55f8e8709b689d939b6bc"
-dependencies = [
- "serde",
- "serde_json",
-]
-
-[[package]]
-name = "unicode-ident"
-version = "1.0.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22049a19f4a68748a168c0fc439f9516686aa045927ff767eca0a85101fb6e73"
-
-[[package]]
-name = "unicode-xid"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f962df74c8c05a667b5ee8bcf162993134c104e96440b663c8daa176dc772d8c"
-
-[[package]]
-name = "utf16_iter"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52df8b7fb78e7910d776fccf2e42ceaf3604d55e8e7eb2dbd183cb1441d8a692"
-
-[[package]]
-name = "utf8_iter"
-version = "1.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64a8922555b9500e3d865caed19330172cd67cbf82203f1a3311d8c305cc9f33"
-
-[[package]]
-name = "walkdir"
-version = "2.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36df944cda56c7d8d8b7496af378e6b16de9284591917d307c9b4d313c44e698"
-dependencies = [
- "same-file",
- "winapi-util",
-]
-
-[[package]]
-name = "wasm-bindgen"
-version = "0.2.87"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7706a72ab36d8cb1f80ffbf0e071533974a60d0a308d01a5d0375bf60499a342"
-dependencies = [
- "cfg-if",
- "wasm-bindgen-macro",
-]
-
-[[package]]
-name = "wasm-bindgen-backend"
-version = "0.2.87"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ef2b6d3c510e9625e5fe6f509ab07d66a760f0885d858736483c32ed7809abd"
-dependencies = [
- "bumpalo",
- "log",
- "once_cell",
- "proc-macro2",
- "quote",
- "syn",
- "wasm-bindgen-shared",
-]
-
-[[package]]
-name = "wasm-bindgen-macro"
-version = "0.2.87"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dee495e55982a3bd48105a7b947fd2a9b4a8ae3010041b9e0faab3f9cd028f1d"
-dependencies = [
- "quote",
- "wasm-bindgen-macro-support",
-]
-
-[[package]]
-name = "wasm-bindgen-macro-support"
-version = "0.2.87"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "wasm-bindgen-backend",
- "wasm-bindgen-shared",
-]
-
-[[package]]
-name = "wasm-bindgen-shared"
-version = "0.2.87"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca6ad05a4870b2bf5fe995117d3728437bd27d7cd5f06f13c17443ef369775a1"
-
-[[package]]
-name = "web-sys"
-version = "0.3.64"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b85cbef8c220a6abc02aefd892dfc0fc23afb1c6a426316ec33253a3877249b"
-dependencies = [
- "js-sys",
- "wasm-bindgen",
-]
-
-[[package]]
-name = "winapi"
-version = "0.3.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
-dependencies = [
- "winapi-i686-pc-windows-gnu",
- "winapi-x86_64-pc-windows-gnu",
-]
-
-[[package]]
-name = "winapi-i686-pc-windows-gnu"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-
-[[package]]
-name = "winapi-util"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
-dependencies = [
- "winapi",
-]
-
-[[package]]
-name = "winapi-x86_64-pc-windows-gnu"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-
-[[package]]
-name = "windows-sys"
-version = "0.52.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
-dependencies = [
- "windows-targets",
-]
-
-[[package]]
-name = "windows-targets"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
-dependencies = [
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_gnullvm",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
-]
-
-[[package]]
-name = "windows_aarch64_gnullvm"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
-
-[[package]]
-name = "windows_aarch64_msvc"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
-
-[[package]]
-name = "windows_i686_gnu"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
-
-[[package]]
-name = "windows_i686_gnullvm"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
-
-[[package]]
-name = "windows_i686_msvc"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
-
-[[package]]
-name = "windows_x86_64_gnu"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
-
-[[package]]
-name = "windows_x86_64_gnullvm"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
-
-[[package]]
-name = "windows_x86_64_msvc"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
-
-[[package]]
-name = "write16"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d1890f4022759daae28ed4fe62859b1236caebfc61ede2f63ed4e695f3f6d936"
-
-[[package]]
-name = "writeable"
-version = "0.5.5"
-dependencies = [
- "either",
-]
-
-[[package]]
-name = "yoke"
-version = "0.7.4"
-dependencies = [
- "serde",
- "stable_deref_trait",
- "yoke-derive",
- "zerofrom",
-]
-
-[[package]]
-name = "yoke-derive"
-version = "0.7.4"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "synstructure",
-]
-
-[[package]]
-name = "zerofrom"
-version = "0.1.4"
-dependencies = [
- "zerofrom-derive",
-]
-
-[[package]]
-name = "zerofrom-derive"
-version = "0.1.4"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "synstructure",
-]
-
-[[package]]
-name = "zerotrie"
-version = "0.1.3"
-dependencies = [
- "displaydoc",
- "litemap",
- "serde",
- "yoke",
- "zerofrom",
- "zerovec",
-]
-
-[[package]]
-name = "zerovec"
-version = "0.10.2"
-dependencies = [
- "serde",
- "yoke",
- "zerofrom",
- "zerovec-derive",
-]
-
-[[package]]
-name = "zerovec-derive"
-version = "0.10.2"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
diff --git a/provider/testdata/Cargo.toml b/provider/testdata/Cargo.toml
deleted file mode 100644
index bea30fef33a..00000000000
--- a/provider/testdata/Cargo.toml
+++ /dev/null
@@ -1,105 +0,0 @@
-# This file is part of ICU4X. For terms of use, please see the file
-# called LICENSE at the top level of the ICU4X source tree
-# (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
-
-[package]
-name = "icu_testdata"
-description = "Pre-built test data for ICU4X"
-version = "1.5.0"
-rust-version = "1.67.0"
-authors = ["The ICU4X Project Developers"]
-edition = "2021"
-readme = "README.md"
-repository = "https://github.com/unicode-org/icu4x"
-homepage = "https://icu4x.unicode.org"
-license = "Unicode-3.0"
-categories = ["internationalization"]
-# Keep this in sync with other crates unless there are exceptions
-include = [
-    "src/**/*",
-    "examples/**/*",
-    "benches/**/*",
-    "tests/**/*",
-    "Cargo.toml",
-    "LICENSE",
-    "README.md",
-    # Exception: We want to be able to run tests, so
-    # we include the test data
-    "data/**/*",
-    "!data/postcard/**/*",
-]
-
-[package.metadata.docs.rs]
-all-features = true
-
-[dependencies]
-icu_provider = { version = "~1.5.0", path = "../core", default-features = false }
-icu_provider_adapters = { version = "~1.5.0", path = "../adapters", default-features = false }
-
-# buffer feature
-icu_provider_blob = { version = "~1.5.0", path = "../blob", default-features = false, optional = true }
-
-# databake deps
-icu_locid = { version = "~1.5.0", path = "../../components/locid", default-features = false }
-icu_collections = { version = "~1.5.0", path = "../../components/collections", default-features = false }
-icu_pattern = { version = "0.2.0", path = "../../utils/pattern", default-features = false }
-zerovec = { version = "0.10.0", path = "../../utils/zerovec", default-features = false }
-zerotrie = { version = "0.1.0", path = "../../utils/zerotrie" }
-
-# databake options
-icu_calendar = { version = "~1.5.0", path = "../../components/calendar", default-features = false, optional = true }
-icu_casemap = { version = "~1.5.0", path = "../../components/casemap", default-features = false, optional = true }
-icu_collator = { version = "~1.5.0", path = "../../components/collator", default-features = false, optional = true }
-icu_datetime = { version = "~1.5.0", path = "../../components/datetime", default-features = false, optional = true }
-icu_decimal = { version = "~1.5.0", path = "../../components/decimal", default-features = false, optional = true }
-icu_list = { version = "~1.5.0", path = "../../components/list", default-features = false, optional = true }
-icu_locid_transform = { version = "~1.5.0", path = "../../components/locid_transform", default-features = false, optional = true }
-icu_normalizer = { version = "~1.5.0", path = "../../components/normalizer", default-features = false, optional = true }
-icu_plurals = { version = "~1.5.0", path = "../../components/plurals", default-features = false, optional = true }
-icu_properties = { version = "~1.5.0", path = "../../components/properties", default-features = false, optional = true }
-icu_segmenter = { version = "~1.5.0", path = "../../components/segmenter", default-features = false, optional = true }
-icu_timezone = { version = "~1.5.0", path = "../../components/timezone", default-features = false, optional = true }
-
-icu_experimental = { version = "0.1.0", path = "../../components/experimental", default-features = false, optional = true }
-
-[dev-dependencies]
-icu = { path = "../../components/icu", default-features = false }
-
-[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
-criterion = "0.5"
-
-
-[features]
-default = [
-    "icu_calendar",
-    "icu_collator",
-    "icu_datetime",
-    "icu_decimal",
-    "icu_list",
-    "icu_locid_transform",
-    "icu_normalizer",
-    "icu_plurals",
-    "icu_properties",
-    "icu_segmenter",
-    "icu_timezone",
-]
-icu_datetime_experimental = [
-    "icu_datetime/experimental",
-]
-icu_plurals_experimental = [
-    "icu_plurals/experimental",
-]
-buffer = ["dep:icu_provider_blob", "icu_provider/sync", "icu_provider_adapters/serde"]
-std = []
-
-[package.metadata.cargo-all-features]
-skip_optional_dependencies = true
-denylist = ["internal_all_features_hack"]
-extra_features = [
-    "icu_datetime",
-    "icu_list",
-]
-
-[[bench]]
-name = "providers"
-harness = false
diff --git a/provider/testdata/LICENSE b/provider/testdata/LICENSE
deleted file mode 100644
index c9be6012c53..00000000000
--- a/provider/testdata/LICENSE
+++ /dev/null
@@ -1,46 +0,0 @@
-UNICODE LICENSE V3
-
-COPYRIGHT AND PERMISSION NOTICE
-
-Copyright © 2020-2024 Unicode, Inc.
-
-NOTICE TO USER: Carefully read the following legal agreement. BY
-DOWNLOADING, INSTALLING, COPYING OR OTHERWISE USING DATA FILES, AND/OR
-SOFTWARE, YOU UNEQUIVOCALLY ACCEPT, AND AGREE TO BE BOUND BY, ALL OF THE
-TERMS AND CONDITIONS OF THIS AGREEMENT. IF YOU DO NOT AGREE, DO NOT
-DOWNLOAD, INSTALL, COPY, DISTRIBUTE OR USE THE DATA FILES OR SOFTWARE.
-
-Permission is hereby granted, free of charge, to any person obtaining a
-copy of data files and any associated documentation (the "Data Files") or
-software and any associated documentation (the "Software") to deal in the
-Data Files or Software without restriction, including without limitation
-the rights to use, copy, modify, merge, publish, distribute, and/or sell
-copies of the Data Files or Software, and to permit persons to whom the
-Data Files or Software are furnished to do so, provided that either (a)
-this copyright and permission notice appear with all copies of the Data
-Files or Software, or (b) this copyright and permission notice appear in
-associated Documentation.
-
-THE DATA FILES AND SOFTWARE ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
-KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
-THIRD PARTY RIGHTS.
-
-IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE
-BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES,
-OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
-ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THE DATA
-FILES OR SOFTWARE.
-
-Except as contained in this notice, the name of a copyright holder shall
-not be used in advertising or otherwise to promote the sale, use or other
-dealings in these Data Files or Software without prior written
-authorization of the copyright holder.
-
-SPDX-License-Identifier: Unicode-3.0
-
-—
-
-Portions of ICU4X may have been adapted from ICU4C and/or ICU4J.
-ICU 1.8.1 to ICU 57.1 © 1995-2016 International Business Machines Corporation and others.
diff --git a/provider/testdata/README.md b/provider/testdata/README.md
deleted file mode 100644
index 2a3dfb633a1..00000000000
--- a/provider/testdata/README.md
+++ /dev/null
@@ -1,60 +0,0 @@
-# icu_testdata [![crates.io](https://img.shields.io/crates/v/icu_testdata)](https://crates.io/crates/icu_testdata)
-
-🚧 This crate has been superseded by `ICU4X`'s `compiled_data` feature and is deprecated. Data for new components will not be added, and it will not be updated for `ICU4X` 2.0.
-
-<!-- cargo-rdme start -->
-
-`icu_testdata` is a unit testing crate for [`ICU4X`].
-
-The crate exposes data providers with stable data useful for unit testing. The data is
-based on a CLDR tag and a short list of locales that, together, cover a range of scenarios.
-
-The crate exposes three kinds of providers, corresponding to the three types of constructors
-in ICU:
-* [`unstable`], [`unstable_no_fallback`]
-* [`any`], [`any_no_fallback`]
-* [`buffer`], [`buffer_no_fallback`] (`buffer` Cargo feature)
-
-## Examples
-
-```rust
-use icu::locid::locale;
-use icu_provider::hello_world::HelloWorldFormatter;
-
-// Unstable constructor
-HelloWorldFormatter::try_new_unstable(
-    &icu_testdata::unstable(),
-    &locale!("en-CH").into(),
-).unwrap();
-
-// AnyProvider constructor
-HelloWorldFormatter::try_new_with_any_provider(
-    &icu_testdata::any(),
-    &locale!("en-CH").into(),
-).unwrap();
-
-// BufferProvider constructor (`icu` with `serde` feature, `icu_testdata` with `buffer` feature)
-HelloWorldFormatter::try_new_with_buffer_provider(
-    &icu_testdata::buffer(),
-    &locale!("en-CH").into(),
-).unwrap();
-
-// Without fallback the locale match needs to be exact
-HelloWorldFormatter::try_new_unstable(
-    &icu_testdata::unstable_no_fallback(),
-    &locale!("en-CH").into(),
-).is_err();
-
-HelloWorldFormatter::try_new_unstable(
-    &icu_testdata::unstable_no_fallback(),
-    &locale!("en").into(),
-).unwrap();
-```
-
-[`ICU4X`]: https://docs.rs/icu/latest/icu/
-
-<!-- cargo-rdme end -->
-
-## More Information
-
-For more information on development, authorship, contributing etc. please visit [`ICU4X home page`](https://github.com/unicode-org/icu4x).
diff --git a/provider/testdata/benches/providers.rs b/provider/testdata/benches/providers.rs
deleted file mode 100644
index bb6508f8eb3..00000000000
--- a/provider/testdata/benches/providers.rs
+++ /dev/null
@@ -1,113 +0,0 @@
-// This file is part of ICU4X. For terms of use, please see the file
-// called LICENSE at the top level of the ICU4X source tree
-// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
-
-extern crate alloc;
-
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
-use icu_locid::langid;
-use icu_provider::hello_world::HelloWorldV1Marker;
-use icu_provider::prelude::*;
-use icu_provider::AsDeserializingBufferProvider;
-use icu_provider_blob::BlobDataProvider;
-
-static POSTCARD_BYTES: &[u8] = include_bytes!("../data/testdata.postcard");
-
-struct BakedDataProvider;
-
-mod baked {
-    include!("../data/baked/mod.rs");
-    impl_data_provider!(super::BakedDataProvider);
-    impl_any_provider!(super::BakedDataProvider);
-}
-
-#[inline(never)]
-fn create_static_data_provider() -> BlobDataProvider {
-    icu_provider_blob::BlobDataProvider::try_new_from_static_blob(POSTCARD_BYTES).unwrap()
-}
-
-#[inline(never)]
-fn create_blob_data_provider() -> BlobDataProvider {
-    icu_provider_blob::BlobDataProvider::try_new_from_blob(black_box(POSTCARD_BYTES.into()))
-        .unwrap()
-}
-
-#[inline(never)]
-fn create_baked_data_provider() -> BakedDataProvider {
-    BakedDataProvider
-}
-
-#[inline(never)]
-fn create_baked_any_provider() -> BakedDataProvider {
-    BakedDataProvider
-}
-
-fn providers_bench(c: &mut Criterion) {
-    c.bench_function("provider/construct/static", |b| {
-        b.iter(create_static_data_provider);
-    });
-    c.bench_function("provider/construct/blob", |b| {
-        b.iter(create_blob_data_provider);
-    });
-    c.bench_function("provider/construct/baked", |b| {
-        b.iter(create_baked_data_provider);
-    });
-    c.bench_function("provider/construct/any", |b| {
-        b.iter(create_baked_data_provider);
-    });
-
-    c.bench_function("provider/load/static", |b| {
-        let provider = create_static_data_provider();
-        b.iter(|| {
-            let result: DataResponse<HelloWorldV1Marker> = provider
-                .as_deserializing()
-                .load(DataRequest {
-                    locale: &langid!("ja").into(),
-                    metadata: Default::default(),
-                })
-                .unwrap();
-            result
-        });
-    });
-    c.bench_function("provider/load/blob", |b| {
-        let provider = create_blob_data_provider();
-        b.iter(|| {
-            let result: DataResponse<HelloWorldV1Marker> = provider
-                .as_deserializing()
-                .load(DataRequest {
-                    locale: &langid!("ja").into(),
-                    metadata: Default::default(),
-                })
-                .unwrap();
-            result
-        });
-    });
-    c.bench_function("provider/load/baked", |b| {
-        let provider = create_baked_data_provider();
-        b.iter(|| {
-            let result: DataResponse<HelloWorldV1Marker> = provider
-                .load(DataRequest {
-                    locale: &langid!("ja").into(),
-                    metadata: Default::default(),
-                })
-                .unwrap();
-            result
-        });
-    });
-    c.bench_function("provider/load/any", |b| {
-        let provider = create_baked_any_provider();
-        b.iter(|| {
-            let result: DataResponse<HelloWorldV1Marker> = provider
-                .as_downcasting()
-                .load(DataRequest {
-                    locale: &langid!("ja").into(),
-                    metadata: Default::default(),
-                })
-                .unwrap();
-            result
-        });
-    });
-}
-
-criterion_group!(benches, providers_bench,);
-criterion_main!(benches);
diff --git a/provider/testdata/src/lib.rs b/provider/testdata/src/lib.rs
deleted file mode 100644
index 11a72c56d22..00000000000
--- a/provider/testdata/src/lib.rs
+++ /dev/null
@@ -1,231 +0,0 @@
-// This file is part of ICU4X. For terms of use, please see the file
-// called LICENSE at the top level of the ICU4X source tree
-// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
-
-//! `icu_testdata` is a unit testing crate for [`ICU4X`].
-//!
-//! The crate exposes data providers with stable data useful for unit testing. The data is
-//! based on a CLDR tag and a short list of locales that, together, cover a range of scenarios.
-//!
-//! The crate exposes three kinds of providers, corresponding to the three types of constructors
-//! in ICU:
-//! * [`unstable`], [`unstable_no_fallback`]
-//! * [`any`], [`any_no_fallback`]
-//! * [`buffer`], [`buffer_no_fallback`] (`buffer` Cargo feature)
-//!
-//! # Examples
-//!
-//! ```
-//! use icu::locid::locale;
-//! use icu_provider::hello_world::HelloWorldFormatter;
-//!
-//! // Unstable constructor
-//! HelloWorldFormatter::try_new_unstable(
-//!     &icu_testdata::unstable(),
-//!     &locale!("en-CH").into(),
-//! ).unwrap();
-//!
-//! // AnyProvider constructor
-//! HelloWorldFormatter::try_new_with_any_provider(
-//!     &icu_testdata::any(),
-//!     &locale!("en-CH").into(),
-//! ).unwrap();
-//!
-//! // BufferProvider constructor (`icu` with `serde` feature, `icu_testdata` with `buffer` feature)
-//! HelloWorldFormatter::try_new_with_buffer_provider(
-//!     &icu_testdata::buffer(),
-//!     &locale!("en-CH").into(),
-//! ).unwrap();
-//!
-//! // Without fallback the locale match needs to be exact
-//! HelloWorldFormatter::try_new_unstable(
-//!     &icu_testdata::unstable_no_fallback(),
-//!     &locale!("en-CH").into(),
-//! ).is_err();
-//!
-//! HelloWorldFormatter::try_new_unstable(
-//!     &icu_testdata::unstable_no_fallback(),
-//!     &locale!("en").into(),
-//! ).unwrap();
-//! ```
-//!
-//! [`ICU4X`]: https://docs.rs/icu/latest/icu/
-
-// https://github.com/unicode-org/icu4x/blob/main/documents/process/boilerplate.md#library-annotations
-#![cfg_attr(not(any(test, feature = "std")), no_std)]
-#![cfg_attr(
-    not(test),
-    deny(
-        clippy::indexing_slicing,
-        clippy::unwrap_used,
-        clippy::expect_used,
-        clippy::panic,
-        clippy::exhaustive_structs,
-        clippy::exhaustive_enums,
-        missing_debug_implementations,
-    )
-)]
-#![warn(missing_docs)]
-#![allow(unused_imports)] // too many feature combinations too keep track of
-#![allow(deprecated)]
-#![deprecated(since = "1.3.0", note = "this crate has been superseded by `ICU4X`'s `compiled_data` feature. Data for new components will not be added, and it will not be updated for `ICU4X` 2.0.")]
-
-extern crate alloc;
-
-#[path = "../data/metadata.rs.data"]
-mod metadata;
-
-#[deprecated(since = "1.3.0")]
-pub mod versions {
-    //! Functions to access version info of the ICU test data.
-
-    /// Gets the CLDR tag used as the test data source (for formatters, likely subtags, ...)
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// assert_eq!("44.0.0", icu_testdata::versions::cldr_tag());
-    /// ```
-    #[deprecated(since = "1.3.0")]
-    pub fn cldr_tag() -> alloc::string::String {
-        alloc::string::String::from(super::metadata::CLDR_TAG)
-    }
-
-    /// Gets the ICU tag used as the test data source (for properties, collator, ...)
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// assert_eq!("release-74-1", icu_testdata::versions::icu_tag());
-    /// ```
-    #[deprecated(since = "1.3.0")]
-    pub fn icu_tag() -> alloc::string::String {
-        alloc::string::String::from(super::metadata::ICUEXPORT_TAG)
-    }
-}
-
-/// Gets the locales supported by the test data.
-///
-/// # Examples
-///
-/// ```
-/// # use icu_locid::langid;
-/// assert!(icu_testdata::locales().contains(&langid!("es-AR")));
-/// assert!(icu_testdata::locales().len() > 10);
-/// ```
-#[deprecated(since = "1.3.0")]
-pub fn locales() -> alloc::vec::Vec<icu_locid::LanguageIdentifier> {
-    alloc::vec::Vec::from(metadata::LOCALES)
-}
-
-#[cfg(feature = "std")]
-#[deprecated(since = "1.3.0")]
-/// Get paths to the test data directories. Some of these paths do not
-/// exist anymore, and data should only be accessed through the functions
-/// provided by this crate.
-pub mod paths {
-    use std::path::PathBuf;
-
-    #[deprecated(since = "1.3.0")]
-    /// Returns the absolute path to the top-level data directory.
-    pub fn data_root() -> PathBuf {
-        PathBuf::from(std::env!("CARGO_MANIFEST_DIR")).join("data")
-    }
-
-    #[deprecated(since = "1.3.0")]
-    /// Returns the absolute path to the CLDR JSON root directory.
-    pub fn cldr_json_root() -> PathBuf {
-        data_root().join("cldr")
-    }
-
-    #[deprecated(since = "1.3.0")]
-    /// Returns the absolute path to the icuexport TOML root directory.
-    pub fn icuexport_toml_root() -> PathBuf {
-        data_root().join("icuexport")
-    }
-
-    #[deprecated(since = "1.3.0")]
-    /// Returns the absolute path to the collation tailoring TOML root directory.
-    pub fn coll_toml_root() -> PathBuf {
-        data_root().join("coll")
-    }
-}
-
-use icu_provider::prelude::*;
-use icu_provider_adapters::fallback::LocaleFallbackProvider;
-
-/// A data provider that is compatible with all ICU `_unstable` constructors.
-///
-/// The return type of this method is not considered stable, mirroring the unstable trait
-/// bounds of the constructors. For matching versions of `icu` and `icu_testdata`, however,
-/// these are guaranteed to match.
-#[cfg(feature = "icu_locid_transform")]
-#[deprecated(since = "1.3.0", note = "use `compiled_data`")]
-pub fn unstable() -> LocaleFallbackProvider<UnstableDataProvider> {
-    // The statically compiled data file is valid.
-    #[allow(clippy::unwrap_used)]
-    LocaleFallbackProvider::try_new_unstable(unstable_no_fallback()).unwrap()
-}
-
-/// A data provider that is compatible with all ICU `_unstable` constructors.
-///
-/// The return type of this method is not considered stable, mirroring the unstable trait
-/// bounds of the constructors. For matching versions of `icu` and `icu_testdata`, however,
-/// these are guaranteed to match.
-#[deprecated(since = "1.3.0", note = "use `compiled_data`")]
-pub fn unstable_no_fallback() -> UnstableDataProvider {
-    UnstableDataProvider
-}
-
-/// An [`AnyProvider`] backed by baked data.
-#[cfg(feature = "icu_locid_transform")]
-#[deprecated(since = "1.3.0", note = "use `compiled_data`")]
-pub fn any() -> impl AnyProvider {
-    // The baked data is valid.
-    #[allow(clippy::unwrap_used)]
-    LocaleFallbackProvider::try_new_with_any_provider(any_no_fallback()).unwrap()
-}
-
-/// An [`AnyProvider`] backed by baked data.
-#[deprecated(since = "1.3.0", note = "use `compiled_data`")]
-pub fn any_no_fallback() -> impl AnyProvider {
-    UnstableDataProvider
-}
-
-/// A [`BufferProvider`] backed by a Postcard blob.
-///
-/// This deserializes a large data blob from static memory, please cache the result if you
-/// are calling this repeatedly and care about performance
-#[cfg(feature = "buffer")]
-#[deprecated(since = "1.3.0", note = "use `compiled_data`")]
-pub fn buffer() -> impl BufferProvider {
-    // The statically compiled data file is valid.
-    #[allow(clippy::unwrap_used)]
-    LocaleFallbackProvider::try_new_with_buffer_provider(buffer_no_fallback()).unwrap()
-}
-
-/// A [`BufferProvider`] backed by a Postcard blob.
-///
-/// This deserializes a large data blob from static memory, please cache the result if you
-/// are calling this repeatedly and care about performance
-#[cfg(feature = "buffer")]
-#[deprecated(since = "1.3.0", note = "use `compiled_data`")]
-pub fn buffer_no_fallback() -> impl BufferProvider {
-    #[allow(clippy::unwrap_used)] // The statically compiled data file is valid.
-    icu_provider_blob::BlobDataProvider::try_new_from_static_blob(include_bytes!(
-        "../data/testdata.postcard"
-    ))
-    .unwrap()
-}
-
-#[doc(hidden)]
-#[non_exhaustive]
-#[derive(Debug)]
-#[deprecated(since = "1.3.0", note = "use `compiled_data`")]
-pub struct UnstableDataProvider;
-
-mod baked {
-    include!("../data/baked/mod.rs");
-    impl_data_provider!(super::UnstableDataProvider);
-    impl_any_provider!(super::UnstableDataProvider);
-}
diff --git a/tools/make/data.toml b/tools/make/data.toml
index 58e2adc7be2..0fc6d3a27d5 100644
--- a/tools/make/data.toml
+++ b/tools/make/data.toml
@@ -75,30 +75,6 @@ if greater_than ${output_length} 0
 end
 '''
 
-[tasks.testdata-legacy]
-description = "Build the data for the legacy icu_testdata crate"
-category = "ICU4X Data"
-command = "cargo"
-args = [
-    "run",
-    "--bin=make-testdata-legacy",
-    "--release",
-    "--manifest-path=tools/testdata-scripts/Cargo.toml", # avoid global feature resolution
-]
-
-[tasks.testdata-legacy-test]
-description = "Verify the data for the legacy icu_testdata crate"
-category = "ICU4X Data"
-script_runner = "@duckscript"
-script = """
-    cd provider/testdata
-    set_env CARGO_TARGET_DIR "../../target"
-    exec --fail-on-error cargo check-all-features
-    exec --fail-on-error cargo test --all-features --all-targets
-    set_env RUSTDOCFLAGS -Dwarnings
-    exec --fail-on-error cargo doc --all-features --no-deps
-"""
-
 [tasks.bakeddata]
 description = "Builds full baked data"
 category = "ICU4X Data"
diff --git a/tools/testdata-scripts/Cargo.toml b/tools/testdata-scripts/Cargo.toml
index b5cfcf51ad4..0b6ac2a4a1c 100644
--- a/tools/testdata-scripts/Cargo.toml
+++ b/tools/testdata-scripts/Cargo.toml
@@ -10,15 +10,13 @@ edition = "2021"
 
 [dependencies]
 crlify = { workspace = true }
-databake = { workspace = true }
-icu_datagen = { workspace = true, features = ["legacy_api", "use_wasm", "networking", "experimental_components"] }
+icu_datagen = { workspace = true, features = ["provider"] }
 icu_locid = { workspace = true, features = ["databake"] }
 icu_provider = { workspace = true }
 
 clap = { workspace = true, features = ["derive"] }
 eyre = { workspace = true }
 log = { workspace = true }
-quote = { workspace = true }
 simple_logger = { workspace = true }
 ureq = { workspace = true }
 zip = { workspace = true, features = ["deflate"] }
diff --git a/tools/testdata-scripts/src/bin/make-testdata-legacy.rs b/tools/testdata-scripts/src/bin/make-testdata-legacy.rs
deleted file mode 100644
index 46685caccf3..00000000000
--- a/tools/testdata-scripts/src/bin/make-testdata-legacy.rs
+++ /dev/null
@@ -1,88 +0,0 @@
-// This file is part of ICU4X. For terms of use, please see the file
-// called LICENSE at the top level of the ICU4X source tree
-// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
-
-use icu_datagen::prelude::*;
-use std::fs::File;
-use std::io::Write;
-use std::path::Path;
-
-include!("../../../../provider/datagen/tests/locales.rs.data");
-
-fn main() {
-    #![allow(deprecated)] // want to keep old datagen code path covered
-
-    simple_logger::SimpleLogger::new()
-        .env()
-        .with_level(log::LevelFilter::Info)
-        .init()
-        .unwrap();
-
-    let data_root = Path::new(concat!(
-        core::env!("CARGO_MANIFEST_DIR"),
-        "/../../provider/testdata/data/"
-    ));
-
-    std::fs::create_dir_all(data_root).unwrap();
-
-    let source = SourceData::default()
-        .with_cldr_latest(Default::default())
-        .unwrap()
-        .with_icuexport_latest()
-        .unwrap();
-
-    let blob_out = Out::Blob(Box::new(
-        File::create(data_root.join("testdata.postcard")).unwrap(),
-    ));
-
-    let mut options = BakedOptions::default();
-    options.insert_feature_gates = true;
-    options.use_separate_crates = true;
-    options.overwrite = true;
-    let mod_out = Out::Baked {
-        mod_directory: data_root.join("baked"),
-        options,
-    };
-
-    icu_datagen::datagen(
-        Some(LOCALES),
-        &icu_datagen::all_keys_with_experimental()
-            .into_iter()
-            .chain([icu_provider::hello_world::HelloWorldV1Marker::KEY])
-            .collect::<Vec<_>>(),
-        &source,
-        vec![blob_out, mod_out],
-    )
-    .unwrap();
-
-    let mut metadata = File::create(data_root.join("metadata.rs.data")).unwrap();
-
-    metadata
-        .write_all(
-            "\
-            // DO NOT EDIT\n\
-            // This file is generated by `make-testdata` from\n\
-            // * locales.rs.data,\n\
-            // * `icu_datagen::SourceData::LATEST_TESTED_*`.\n\
-            \n\
-            "
-            .as_bytes(),
-        )
-        .unwrap();
-
-    let locales = databake::Bake::bake(LOCALES, &Default::default());
-    let cldr_tag = SourceData::LATEST_TESTED_CLDR_TAG;
-    let icu_tag = SourceData::LATEST_TESTED_ICUEXPORT_TAG;
-
-    metadata
-        .write_all(
-            quote::quote! {
-                pub const LOCALES: &[icu_locid::LanguageIdentifier] = &#locales;
-                pub const CLDR_TAG: &str = #cldr_tag;
-                pub const ICUEXPORT_TAG: &str = #icu_tag;
-            }
-            .to_string()
-            .as_bytes(),
-        )
-        .unwrap();
-}