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document `FromIterator for Vec` allocation behaviors [t-libs discussion](https://rust-lang.zulipchat.com/#narrow/stream/259402-t-libs.2Fmeetings/topic/Meeting.202024-01-24/near/417686526) about #120091 didn't reach a strong consensus, but it was agreed that if we keep the current behavior it should at least be documented even though it is an implementation detail. The language is intentionally non-committal. The previous (non-existent) documentation permits a lot of implementation leeway and we want retain that. In some cases we even must retain it to be able to rip out some code paths that rely on unstable features.
The Rust Programming Language
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