Proposal to unban weak let bindings

[nickolas-pohilets]

• Discussion - https://forums.swift.org/t/weak-captures-in-sendable-sending-closures/78498
• Pitch - https://forums.swift.org/t/pitch-weak-let/79271
• Implementation - [SE-0481] Allow weak let and make weak captures immutable swift#80440

[PsychoH13]

I feel like the workaround is more likely to be seen as a bug than a feature to be extended.

[rjmccall]

@nickolas-pohilets I'm going to make an editorial pass over your proposal document, but please feel free to go ahead and start a pitch thread. We do have an expectation that proposals will be separately pitched; the existing discussion thread (which, according to its title, is actually about captures) is not enough.

[nickolas-pohilets]

Started - https://forums.swift.org/t/pitch-weak-let/79271