Type metadata documentation

Is there an up to date version that describes type metadata?

This doc admits it's not up to date:

    Warning: this is all out of date!

I don't believe there's an up to document. Your best bet (which I hate to say) is to read swift/include/swift/ABI/Metadata.h at main · swiftlang/swift · GitHub

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This sounds like a very low-complexity contributing opportunity. :slightly_smiling_face: