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I recommend leaving the defaults as-is for the action: you don't need to specify `gradle-home-cache-includes` unless you have a specific reason to do so.

are those defaults clearly documented somewhere?  Iirc `jdks` aren’t included by default.

I don't think it's completely documented, but you can get a good idea from these README sections:

• <https://github.com/gradle/gradle-build-action?tab=readme-ov-file#which-content-is-cached>
• <https://github.com/gradle/gradle-build-action?tab=readme-ov-file#deduplication-of-gradle-user-home-cache-entries>

The canonical answer comes from:
• The <https://github.com/gradle/gradle-build-action/blob/main/action.yml#L42-L47|default value of gradle-home-cache-includes>

• The <https://github.com/gradle/gradle-build-action/blob/main/src/cache-extract-entries.ts#L338-L363|extracted cache entry definitions>

The latter includes stuff from _inside_ the includes that we extract for deduplication AND stuff from _outside_ the includes that we bundle and cache.