How to check whether a key path is writable?

[dan-zheng]

Thanks for the replies!

@jrose

I can't think of a single case where code asking if a key path was writable would be correct to do so.

I agree that this makes sense, after some thought.

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I actually don't have a well-scoped use case - I'm asking this question after a quick chat with a colleague.

The use case is "derived conformances" for "partially codable" types: ideas are raw and the use case isn't tied to key paths, so I don't think it's productive to discuss it in detail.