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Tracking issue for push_all stabilization #27744

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@aturon

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@aturon

The Vec::push_all method special-cases pushing a slice onto a vector, and historically has performed much better than using extend (depending on how LLVM optimizations are working out).

We need to offer a method with maximal performance somehow, but ideally this would come from extend, either through optimization or through impl specialization.

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    B-unstableBlocker: Implemented in the nightly compiler and unstable.T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.final-comment-periodIn the final comment period and will be merged soon unless new substantive objections are raised.

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