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8b87fefd76
Optimize multi-char string patterns Uses specialization for `[T]::contains` from #130991 to optimize multi-char patterns in string searches. Requesting a perf run to see if this actually has an effect 🙏 (I think that adding `char` to the list of types for which the `SliceContains` is specialized is a good idea, even if it doesn't show up on perf - might be helpful for downstream users)