[swift-corelibs-dev] KVC dependent classes

[Brent Royal-Gordon]

> Sorry, I said NSProgress but I meant NSPredicate. I personally can't even imagine what a alternative API for NSPredicate would look like 🤔

Use reflection.

Match against only dictionaries with string keys.

Match against only objects conforming to some dictionary-with-string-keys-like protocol.

Match against only objects conforming to an NSKeyValueCoding protocol with a `value(forKey:)` requirement.

Don't actually implement matching; just use it as an abstraction for things like CloudKit and Core Data.

There are options.

-- 
Brent Royal-Gordon
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