fmt: unify array and slice formatting for bytes and other types
Make verbs b,c,o and U work for any array and slice of integer type including byte and uint8. Fix a bug that triggers badverb for []uint8 and []byte type on the slice/array level instead of on each element like for any other slice or array type. Add tests that make sure we do not accidentally alter the behavior of printing []byte for []byte and []uint8 type if they are used at the top level when formatting with %#v. name old time/op new time/op delta SprintfHexBytes-2 177ns ± 2% 176ns ± 2% ~ (p=0.066 n=48+49) SprintfBytes-2 330ns ± 1% 329ns ± 1% ~ (p=0.118 n=45+47) Fixes #13478 Change-Id: I99328a184973ae219bcc0f69c3978cb1ff462888 Reviewed-on: https://go-review.googlesource.com/20686 Run-TryBot: Rob Pike <r@golang.org> Reviewed-by:Rob Pike <r@golang.org>
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