Property Wrapper causing excessive array copying

Okay, it works. I have tweaked the synthesis of the coroutines so it yields the wrappedValue in case we have a property wrapper and the code now runs as fast as it did without using a wrapper.

I also had to change the property's ReadWriteImplKind to Modify. Does this approach look okay @John_McCall?

(oops, just realised I posted in the wrong thread, I should've posted here. Sorry)

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