diff --git a/.github/workflows/benchmarks.yml b/.github/workflows/benchmarks.yml
index 609f60bb..a3075cdf 100644
--- a/.github/workflows/benchmarks.yml
+++ b/.github/workflows/benchmarks.yml
@@ -16,6 +16,7 @@ jobs:
           - "locked"
         php-version:
           - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
@@ -31,14 +32,16 @@ jobs:
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
 
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
       - name: "Cache dependencies"
         uses: "actions/cache@v2"
         with:
-          path: |
-            ~/.composer/cache
-            vendor
-          key: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
-          restore-keys: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.lock') }}"
+          restore-keys: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"
 
       - name: "Install lowest dependencies"
         if: ${{ matrix.dependencies == 'lowest' }}
diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index f25fbe95..11a72075 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -31,14 +31,16 @@ jobs:
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
 
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
       - name: "Cache dependencies"
         uses: "actions/cache@v2"
         with:
-          path: |
-            ~/.composer/cache
-            vendor
-          key: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
-          restore-keys: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.lock') }}"
+          restore-keys: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"
 
       - name: "Install lowest dependencies"
         if: ${{ matrix.dependencies == 'lowest' }}
diff --git a/.github/workflows/composer-json-lint.yml b/.github/workflows/composer-json-lint.yml
index 949e3918..bbcbcf9d 100644
--- a/.github/workflows/composer-json-lint.yml
+++ b/.github/workflows/composer-json-lint.yml
@@ -31,14 +31,16 @@ jobs:
           ini-values: memory_limit=-1
           tools: composer:v2, composer-normalize, composer-require-checker, composer-unused
 
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
       - name: "Cache dependencies"
         uses: "actions/cache@v2"
         with:
-          path: |
-            ~/.composer/cache
-            vendor
-          key: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
-          restore-keys: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.lock') }}"
+          restore-keys: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"
 
       - name: "Install lowest dependencies"
         if: ${{ matrix.dependencies == 'lowest' }}
diff --git a/.github/workflows/mutation-tests.yml b/.github/workflows/mutation-tests.yml
index 0707bb2b..d683fb7f 100644
--- a/.github/workflows/mutation-tests.yml
+++ b/.github/workflows/mutation-tests.yml
@@ -31,14 +31,16 @@ jobs:
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
 
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
       - name: "Cache dependencies"
         uses: "actions/cache@v2"
         with:
-          path: |
-            ~/.composer/cache
-            vendor
-          key: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
-          restore-keys: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.lock') }}"
+          restore-keys: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"
 
       - name: "Install lowest dependencies"
         if: ${{ matrix.dependencies == 'lowest' }}
diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index fe8989c7..908e6da1 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -19,6 +19,7 @@ jobs:
           - "development"
         php-version:
           - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
@@ -29,18 +30,21 @@ jobs:
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
         with:
+          coverage: "none"
           php-version: "${{ matrix.php-version }}"
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
 
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
       - name: "Cache dependencies"
         uses: "actions/cache@v2"
         with:
-          path: |
-            ~/.composer/cache
-            vendor
-          key: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
-          restore-keys: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.lock') }}"
+          restore-keys: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"
 
       - name: "Install lowest dependencies"
         if: ${{ matrix.dependencies == 'lowest' }}
@@ -62,7 +66,7 @@ jobs:
         run: "make phpunit"
 
   phpunit-rc:
-    name: "PHPUnit tests on PHP 8"
+    name: "PHPUnit tests (nightly)"
 
     runs-on: ${{ matrix.operating-system }}
 
@@ -71,7 +75,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "8.0"
+          - "8.1"
         operating-system:
           - "ubuntu-latest"
 
@@ -87,14 +91,16 @@ jobs:
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
 
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
       - name: "Cache dependencies"
         uses: "actions/cache@v2"
         with:
-          path: |
-            ~/.composer/cache
-            vendor
-          key: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
-          restore-keys: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.lock') }}"
+          restore-keys: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"
 
       - name: "Install locked dependencies"
         if: ${{ matrix.dependencies == 'locked' }}
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index db6068ad..7e4c9d52 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -31,14 +31,16 @@ jobs:
           ini-values: memory_limit=-1
           tools: composer:v2, cs2pr
 
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
       - name: "Cache dependencies"
         uses: "actions/cache@v2"
         with:
-          path: |
-            ~/.composer/cache
-            vendor
-          key: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
-          restore-keys: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}"
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.lock') }}"
+          restore-keys: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"
 
       - name: "Install lowest dependencies"
         if: ${{ matrix.dependencies == 'lowest' }}
diff --git a/Makefile b/Makefile
index 5f8692ed..734e3d74 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@ phpcs:
 
 .PHONY: phpstan
 phpstan:
-	@vendor/bin/phpstan analyse
+	@vendor/bin/phpstan analyse --memory-limit=-1
 
 .PHONY: phpbench
 phpbench:
diff --git a/composer.json b/composer.json
index 28765557..64354fb7 100644
--- a/composer.json
+++ b/composer.json
@@ -28,8 +28,8 @@
     "require-dev": {
         "infection/infection": "^0.20",
         "lcobucci/coding-standard": "^6.0",
-        "mikey179/vfsstream": "^1.6",
-        "phpbench/phpbench": "^0.17",
+        "mikey179/vfsstream": "^1.6.7",
+        "phpbench/phpbench": "^1.0@alpha",
         "phpstan/extension-installer": "^1.0",
         "phpstan/phpstan": "^0.12",
         "phpstan/phpstan-deprecation-rules": "^0.12",
diff --git a/composer.lock b/composer.lock
index 7a0657eb..184911f1 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "2dc31d2b3c358993b89dba8e31a661e7",
+    "content-hash": "1dfa158f0ebfc4a67352f7e88501d34c",
     "packages": [
         {
             "name": "lcobucci/clock",
@@ -917,154 +917,6 @@
             },
             "time": "2020-09-05T21:36:16+00:00"
         },
-        {
-            "name": "lstrojny/functional-php",
-            "version": "1.14.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/lstrojny/functional-php.git",
-                "reference": "9e8363e3cb9db924327f51b5804f4dfba03605aa"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/lstrojny/functional-php/zipball/9e8363e3cb9db924327f51b5804f4dfba03605aa",
-                "reference": "9e8363e3cb9db924327f51b5804f4dfba03605aa",
-                "shasum": ""
-            },
-            "require": {
-                "php": "~7"
-            },
-            "require-dev": {
-                "friendsofphp/php-cs-fixer": "^2.14",
-                "phpunit/phpunit": "~7",
-                "squizlabs/php_codesniffer": "~3.0"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "Functional\\": "src/Functional"
-                },
-                "files": [
-                    "src/Functional/Ary.php",
-                    "src/Functional/Average.php",
-                    "src/Functional/ButLast.php",
-                    "src/Functional/Capture.php",
-                    "src/Functional/ConstFunction.php",
-                    "src/Functional/CompareOn.php",
-                    "src/Functional/CompareObjectHashOn.php",
-                    "src/Functional/Compose.php",
-                    "src/Functional/Concat.php",
-                    "src/Functional/Contains.php",
-                    "src/Functional/Converge.php",
-                    "src/Functional/Curry.php",
-                    "src/Functional/CurryN.php",
-                    "src/Functional/Difference.php",
-                    "src/Functional/DropFirst.php",
-                    "src/Functional/DropLast.php",
-                    "src/Functional/Each.php",
-                    "src/Functional/Equal.php",
-                    "src/Functional/ErrorToException.php",
-                    "src/Functional/Every.php",
-                    "src/Functional/False.php",
-                    "src/Functional/Falsy.php",
-                    "src/Functional/Filter.php",
-                    "src/Functional/First.php",
-                    "src/Functional/FirstIndexOf.php",
-                    "src/Functional/FlatMap.php",
-                    "src/Functional/Flatten.php",
-                    "src/Functional/Flip.php",
-                    "src/Functional/GreaterThan.php",
-                    "src/Functional/GreaterThanOrEqual.php",
-                    "src/Functional/Group.php",
-                    "src/Functional/Head.php",
-                    "src/Functional/Id.php",
-                    "src/Functional/IfElse.php",
-                    "src/Functional/Identical.php",
-                    "src/Functional/IndexesOf.php",
-                    "src/Functional/Intersperse.php",
-                    "src/Functional/Invoke.php",
-                    "src/Functional/InvokeFirst.php",
-                    "src/Functional/InvokeIf.php",
-                    "src/Functional/InvokeLast.php",
-                    "src/Functional/Invoker.php",
-                    "src/Functional/Last.php",
-                    "src/Functional/LastIndexOf.php",
-                    "src/Functional/LessThan.php",
-                    "src/Functional/LessThanOrEqual.php",
-                    "src/Functional/LexicographicCompare.php",
-                    "src/Functional/Map.php",
-                    "src/Functional/Matching.php",
-                    "src/Functional/Maximum.php",
-                    "src/Functional/Memoize.php",
-                    "src/Functional/Minimum.php",
-                    "src/Functional/None.php",
-                    "src/Functional/Noop.php",
-                    "src/Functional/Not.php",
-                    "src/Functional/OmitKeys.php",
-                    "src/Functional/PartialAny.php",
-                    "src/Functional/PartialLeft.php",
-                    "src/Functional/PartialMethod.php",
-                    "src/Functional/PartialRight.php",
-                    "src/Functional/Partition.php",
-                    "src/Functional/Pick.php",
-                    "src/Functional/Pluck.php",
-                    "src/Functional/Poll.php",
-                    "src/Functional/Product.php",
-                    "src/Functional/Ratio.php",
-                    "src/Functional/ReduceLeft.php",
-                    "src/Functional/ReduceRight.php",
-                    "src/Functional/Reindex.php",
-                    "src/Functional/Reject.php",
-                    "src/Functional/Repeat.php",
-                    "src/Functional/Retry.php",
-                    "src/Functional/Select.php",
-                    "src/Functional/SelectKeys.php",
-                    "src/Functional/SequenceConstant.php",
-                    "src/Functional/SequenceExponential.php",
-                    "src/Functional/SequenceLinear.php",
-                    "src/Functional/Some.php",
-                    "src/Functional/Sort.php",
-                    "src/Functional/Sum.php",
-                    "src/Functional/SuppressError.php",
-                    "src/Functional/Tap.php",
-                    "src/Functional/Tail.php",
-                    "src/Functional/TailRecursion.php",
-                    "src/Functional/TakeLeft.php",
-                    "src/Functional/TakeRight.php",
-                    "src/Functional/True.php",
-                    "src/Functional/Truthy.php",
-                    "src/Functional/Unique.php",
-                    "src/Functional/ValueToKey.php",
-                    "src/Functional/With.php",
-                    "src/Functional/Zip.php",
-                    "src/Functional/ZipAll.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Lars Strojny",
-                    "email": "lstrojny@php.net",
-                    "homepage": "http://usrportage.de"
-                },
-                {
-                    "name": "Max Beutel",
-                    "email": "nash12@gmail.com"
-                }
-            ],
-            "description": "Functional primitives for PHP",
-            "keywords": [
-                "functional"
-            ],
-            "support": {
-                "issues": "https://github.com/lstrojny/functional-php/issues",
-                "source": "https://github.com/lstrojny/functional-php/tree/1.14.1"
-            },
-            "time": "2020-10-12T09:48:50+00:00"
-        },
         {
             "name": "mikey179/vfsstream",
             "version": "v1.6.8",
@@ -1176,16 +1028,16 @@
         },
         {
             "name": "nikic/php-parser",
-            "version": "v4.10.3",
+            "version": "v4.10.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "dbe56d23de8fcb157bbc0cfb3ad7c7de0cfb0984"
+                "reference": "c6d052fc58cb876152f89f532b95a8d7907e7f0e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/dbe56d23de8fcb157bbc0cfb3ad7c7de0cfb0984",
-                "reference": "dbe56d23de8fcb157bbc0cfb3ad7c7de0cfb0984",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/c6d052fc58cb876152f89f532b95a8d7907e7f0e",
+                "reference": "c6d052fc58cb876152f89f532b95a8d7907e7f0e",
                 "shasum": ""
             },
             "require": {
@@ -1226,9 +1078,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v4.10.3"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.10.4"
             },
-            "time": "2020-12-03T17:45:45+00:00"
+            "time": "2020-12-20T10:01:03+00:00"
         },
         {
             "name": "ocramius/package-versions",
@@ -1477,28 +1329,31 @@
         },
         {
             "name": "phpbench/container",
-            "version": "1.2.1",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpbench/container.git",
-                "reference": "2f2b269b3b8cb9a0053cf98f1c3a84866fe7f0e2"
+                "reference": "04054b7c8cb30f948e5a289601c34834db58aa9f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpbench/container/zipball/2f2b269b3b8cb9a0053cf98f1c3a84866fe7f0e2",
-                "reference": "2f2b269b3b8cb9a0053cf98f1c3a84866fe7f0e2",
+                "url": "https://api.github.com/repos/phpbench/container/zipball/04054b7c8cb30f948e5a289601c34834db58aa9f",
+                "reference": "04054b7c8cb30f948e5a289601c34834db58aa9f",
                 "shasum": ""
             },
             "require": {
-                "psr/container": "^1.0"
+                "psr/container": "^1.0",
+                "symfony/options-resolver": "^4.2 || ^5.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.36"
+                "friendsofphp/php-cs-fixer": "^2.16",
+                "phpstan/phpstan": "^0.12.52",
+                "phpunit/phpunit": "^8"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0-dev"
+                    "dev-master": "2.0-dev"
                 }
             },
             "autoload": {
@@ -1519,35 +1374,35 @@
             "description": "Simple, configurable, service container.",
             "support": {
                 "issues": "https://github.com/phpbench/container/issues",
-                "source": "https://github.com/phpbench/container/tree/1.2.1"
+                "source": "https://github.com/phpbench/container/tree/2.0.1"
             },
-            "time": "2020-08-23T23:43:00+00:00"
+            "time": "2020-11-21T10:55:32+00:00"
         },
         {
             "name": "phpbench/dom",
-            "version": "0.2.0",
+            "version": "0.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpbench/dom.git",
-                "reference": "b135378dd0004c05ba5446aeddaf0b83339c1c4c"
+                "reference": "a126b32e83d0541f3c89befa1b166ba32d0048ab"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpbench/dom/zipball/b135378dd0004c05ba5446aeddaf0b83339c1c4c",
-                "reference": "b135378dd0004c05ba5446aeddaf0b83339c1c4c",
+                "url": "https://api.github.com/repos/phpbench/dom/zipball/a126b32e83d0541f3c89befa1b166ba32d0048ab",
+                "reference": "a126b32e83d0541f3c89befa1b166ba32d0048ab",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
-                "php": "^5.4|^7.0"
+                "php": "^7.2|^8.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.6"
+                "phpunit/phpunit": "^8.0|^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0-dev"
+                    "dev-master": "0.3-dev"
                 }
             },
             "autoload": {
@@ -1568,39 +1423,39 @@
             "description": "DOM wrapper to simplify working with the PHP DOM implementation",
             "support": {
                 "issues": "https://github.com/phpbench/dom/issues",
-                "source": "https://github.com/phpbench/dom/tree/master"
+                "source": "https://github.com/phpbench/dom/tree/0.3.0"
             },
-            "time": "2016-02-27T12:15:56+00:00"
+            "time": "2020-10-25T08:41:08+00:00"
         },
         {
             "name": "phpbench/phpbench",
-            "version": "0.17.1",
+            "version": "1.0.0-alpha4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpbench/phpbench.git",
-                "reference": "3211debc3afb9da79d796cf7471d52cad97b17f1"
+                "reference": "a0e8edfc1a308d79b4950648ece538cef7a6446e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpbench/phpbench/zipball/3211debc3afb9da79d796cf7471d52cad97b17f1",
-                "reference": "3211debc3afb9da79d796cf7471d52cad97b17f1",
+                "url": "https://api.github.com/repos/phpbench/phpbench/zipball/a0e8edfc1a308d79b4950648ece538cef7a6446e",
+                "reference": "a0e8edfc1a308d79b4950648ece538cef7a6446e",
                 "shasum": ""
             },
             "require": {
                 "beberlei/assert": "^2.4 || ^3.0",
                 "doctrine/annotations": "^1.2.7",
+                "doctrine/lexer": "^1.2",
                 "ext-dom": "*",
                 "ext-json": "*",
                 "ext-pcre": "*",
                 "ext-reflection": "*",
                 "ext-spl": "*",
-                "lstrojny/functional-php": "1.0 || ^1.2.3",
-                "php": "^7.2",
-                "phpbench/container": "~1.2",
-                "phpbench/dom": "~0.2.0",
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