How is caching (cacheDir) supposed to work?

I enabled caching for my tests by setting the `cacheDir` config property. Now tests run much faster, but changes in files are not picked up? I expected the cache to invalidate when the source file changes.

How is this supposed to work? Whats the benefit of caching if changes are not picked up?
Did I do something wrong?

No file, test, or entry point is identified in the issue. Reproduce the behavior with cacheDir enabled, then inspect how the repository handles cache invalidation when source files change. Done means determining whether the behavior is expected or fixing it so changed files are handled consistently.

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