yaml is dynamically typed

.github/workflows/bundle-ucm.yaml

@@ -204,7 +204,6 @@ jobs:
           name: unison-${{matrix.os}}
           path: ${{env.staging_dir}}/
       - name: restore permissions on ucm
-        if: ${{runner.os}} != 'Windows'
         run: chmod +x ${{env.staging_dir}}/unison
       - name: rename unison -> ucm
         run: mv ${{env.staging_dir}}/unison ${{env.staging_dir}}/ucm
@@ -219,7 +218,10 @@ jobs:
           name: unison-runtime-${{matrix.os}}
           path: ${{env.staging_dir}}/runtime
       - name: restore permissions on unison-runtime
-        if: ${{runner.os}} != 'Windows'
+        # here we have the `if:` not because of the missing .exe on Windows,
+        # nor the lack of need to chmod, but because /runtime/bin/ probably doesn't exist
+        # due to differences in `raco distribute` on Windows vs macOS and Linux.
+        if: runner.os != 'Windows'
         run: chmod +x ${{env.staging_dir}}/runtime/bin/unison-runtime
       - name: download latest unison-local-ui
         run: |

docs/github-actions-help.md

@@ -26,6 +26,12 @@ e.g.
 It's not clear to me when to use `$GITHUB_OUTPUT` vs `$GITHUB_ENV`, but I have been favoring `$GITHUB_ENV` because it requires fewer characters to access.
 However, it seems a little wrong.
 
+### `if:`
+
+Although the type rules don't totally make sense in Github Actions, `if:` takes a Boolean.
+
+Therefore, I think the String interpolation in `if: ${{runner.os}} != 'Windows'` causes the whole expression to become a String, which is coerced to `true`, when you definitely didn't mean `if: true`.  So don't use `${{}}` here.
+
 ### Job names
 
 Job names will automatically get `(${{matrix.os}})` if you don't use `${{matrix.os}}` somewhere in the name.