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Is there any way to specify an input directory for a task that is allowed to not exist (I don't mean that you're allowed to not specify it, I mean specifying a directory that doesn't exist)

I think the best way is to use a `FileCollection` instead when possible, but it isn't always possible

Make the configurable directory `@Internal` and then have the actual input directory `map`ed from it, mapping to `null` if it does not exist?

Then the contents of the directory is not included in the cache key

Because `@Internal` properties aren't included in the cache key at all.

Oh I see what you mean, you mean having two properties?

That works on the surface (it's the same as using a provider that does this). The issue is that if the task value is computed early it won't work.