diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 6657f43..be85fb8 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -14,41 +14,43 @@ jobs:
     runs-on: [ubuntu-latest]
     steps:
       - uses: actions/checkout@v4
+
       - id: get-version
         name: Get Version
         run: |
-          unset version
-          version=$(./sver version)
-          echo "Validating ${version}"
-          ./sver version <<< "$version"
-          echo "version=${version}" >> "$GITHUB_OUTPUT"
-          echo "major=$(./sver get major "$version")" >> "$GITHUB_OUTPUT"
-          echo "minor=$(./sver get minor "$version")" >> "$GITHUB_OUTPUT"
+          echo 'json<<EOF' >>"${GITHUB_OUTPUT}"
+          ./sver json "$(./sver version)" | \
+            tee -a "$GITHUB_OUTPUT" | \
+            jq -C
+          echo EOF >>"${GITHUB_OUTPUT}"
+
       - id: is-existing-release
         name: Checking if Release Exists
         run: |
-          unset version_already_exists
-          if [ "$(
-              gh release list \
-                --json tagName \
-                --jq '
-                  .[] |
-                  select(.tagName == "${{ steps.get-version.outputs.version }}") |
-                  length > 0
-                '
-            )" = true ] ; then
-            echo 'exists=true' >> "$GITHUB_OUTPUT"
+          if [ -n "$(
+            gh release list \
+              --json tagName \
+              --jq '.[] | .tagName' | \
+              ./sver filter '${{ fromJSON(steps.get-version.outputs.json).version }}'
+            )" ] ; then
+            echo exists=true >> "$GITHUB_OUTPUT"
           else
-            echo 'exists=false' >> "$GITHUB_OUTPUT"
-          fi
-      - if: steps.is-existing-release.outputs.exists == 'false'
+            echo exists=false >> "$GITHUB_OUTPUT"
+          fi 
+
+      - env:
+          MAJOR: ${{ fromJSON(steps.get-version.outputs.json).major }} 
+          MINOR: ${{ fromJSON(steps.get-version.outputs.json).minor }} 
+          VERSION: v${{ fromJSON(steps.get-version.outputs.json).version }} 
+        if: steps.is-existing-release.outputs.exists == 'false'
         name: Create New Release
         run: |
           gh release \
-            create "${{ steps.get-version.outputs.version }}" \
+            create "$VERSION" \
             --generate-notes \
             --latest \
             sver
-          git tag -f 'v${{ steps.get-version.outputs.major }}'
-          git tag -f 'v${{ steps.get-version.outputs.major }}.${{ steps.get-version.outputs.minor }}'
+            gh release upload "$VERSION" ./sver
+          git tag -f "v${MAJOR}"
+          git tag -f "v${MAJOR}.${MINOR}"
           git push -f --tags
diff --git a/README.md b/README.md
index b2863d9..9c2c572 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ asdf global sver latest
 #### curl
 You can simply curl a version directly.
 ```bash
-curl -LO https://github.com/robzr/sver/releases/download/v1.2.0/sver
+curl -LO https://github.com/robzr/sver/releases/download/v1.2.1/sver
 ```
 
 #### Homebrew
@@ -63,11 +63,11 @@ Command completion is available for Bash users. Simply add the following to your
 ### Command line usage
 See `sver help` for documentation.
 ```text
-sver v1.2.0 (https://github.com/robzr/sver) self contained cli tool and function
+sver v1.2.1 (https://github.com/robzr/sver) self contained cli tool and function
 library implementing a Semantic Versioning 2 compliant parser and utilities.
 Written in optimized, portable, pure Bash (v3)+ for simplicity & speed.
 
-Usage: sver <command> [<sub_command>] [<version>|<option> ...]
+Usage: sver <command> [<sub_command>] [<version>] [(<constraint>|<option>|<version>) ...]
 
 Commands:
   bump major <version>
@@ -77,8 +77,7 @@ Commands:
   constraint <version> <constraint(s)> -- version constraint evaluation - if
                               version matches constraint(s) ? exit 0 : exit 1
   equals <version1> <version2> -- version1 == version2 ? exit 0 : exit 1
-  filter [constraint] -- filters stdin list, returns only valid SemVers - if
-                         constraint is specified, they also much match
+  filter [constraint] -- filters stdin list, returns only valid SemVers
   greater_than <version1> <version2> -- version1 > version2 ? exit 0 : exit 1
   get major <version>
   get minor <version>
@@ -100,9 +99,11 @@ Versions:
   optional "v" prefix tolerated on input.
 
 Constraints:
-  Multiple comma-delimited constraints can be chained together (boolean AND).
-  Version substrings can be used, and are especially useful with the pessimistic
-  constraint operator. Supported operators:
+  Multiple comma-delimited constraints can be chained together (boolean AND) to
+  form a single constraint expression. Commands that take a list of versions on
+  stdin and take a constraint will filter the input for versions matching the
+  constraint expression. Version substrings can be used, and are especially
+  useful with the pessimistic constraint operator. Supported operators:
     = <version_substring> -- equal (default if no operator specified)
     > <version_substring> -- greater than
     >= <version_substring> -- greater than or equal to
diff --git a/sver b/sver
index 9e4c0c6..d87efd6 100755
--- a/sver
+++ b/sver
@@ -3,7 +3,7 @@
 # shellcheck disable=SC1008,SC2015,SC2096
 # shfmt -i 2 -ci -w
 
-SVER_VERSION=v1.2.0
+SVER_VERSION=v1.2.1
 SVER_INTRO="\
 sver ${SVER_VERSION} (https://github.com/robzr/sver) self contained cli tool and function
 library implementing a Semantic Versioning 2 compliant parser and utilities.
@@ -124,16 +124,6 @@ sver_complete() {
 # bash-only-end
 
 sver_constraint() { # $1=version $2=constraint(s); if matches returns 0 else 1
-  # Evaluates whether version matches constraint(s). Multiple constraints can
-  # be comma separated and will be valuated with boolean AND logic. Syntax is
-  # whitespace-agnostic and matches other commonly used constraint syntax:
-  #   =  <version>  - equals (build metadata is not considered as per spec)
-  #   != <version>  - not equals
-  #   >  <version>  - standard comparisons
-  #   >= <version>  - standard comparisons
-  #   <  <version>  - standard comparisons
-  #   <= <version>  - standard comparisons
-  #   ~> <sub_version>  - pessimistic constraint operator
   local return_status=0
   local constraint constraints operator tmp value version
   sver_normalize -b "$1"
@@ -404,7 +394,7 @@ sver_greater_than() { # if $1 > $2 then return 0 else return 1
 sver_help() {
   # shellcheck disable=SC1078
   echo "${SVER_INTRO}
-Usage: sver <command> [<sub_command>] [<version>|<option> ...]
+Usage: sver <command> [<sub_command>] [<version>] [(<constraint>|<option>|<version>) ...]
 
 Commands:
   bump major <version>
@@ -414,8 +404,7 @@ Commands:
   constraint <version> <constraint(s)> -- version constraint evaluation - if
                               version matches constraint(s) ? exit 0 : exit 1
   equals <version1> <version2> -- version1 == version2 ? exit 0 : exit 1
-  filter [constraint] -- filters stdin list, returns only valid SemVers - if
-                         constraint is specified, they also much match
+  filter [constraint] -- filters stdin list, returns only valid SemVers
   greater_than <version1> <version2> -- version1 > version2 ? exit 0 : exit 1
   get major <version>
   get minor <version>
@@ -437,9 +426,11 @@ Versions:
   optional \"v\" prefix tolerated on input.
 
 Constraints:
-  Multiple comma-delimited constraints can be chained together (boolean AND).
-  Version substrings can be used, and are especially useful with the pessimistic
-  constraint operator. Supported operators:
+  Multiple comma-delimited constraints can be chained together (boolean AND) to
+  form a single constraint expression. Commands that take a list of versions on
+  stdin and take a constraint will filter the input for versions matching the
+  constraint expression. Version substrings can be used, and are especially
+  useful with the pessimistic constraint operator. Supported operators:
     = <version_substring> -- equal (default if no operator specified)
     > <version_substring> -- greater than
     >= <version_substring> -- greater than or equal to