fmt: drop Scanf %X support for bytes and strings? #13585
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It seems like a regularization to accept %X, but there is always a cost to any addition of a feature. Taking that worry too far, we can't change anything ever. The problem of versioning is being addressed by the community, and in that light I think it's fine for this minor cleanup to persist. |
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CL https://go-review.googlesource.com/#/c/15689/ made a trivial change to fmt.Scanf to make %X an alias for %x when applied to []byte and string values.
%x has always (even before Go 1) accepted either upper or lower case; now %X does too.
The only real effect here is that now people can write code using %X, which will only work with Go 1.6 or later, when they could instead use %x and work with Go 1 or later.
Should we keep the new %X support?
Leaving for @robpike to decide.
The original issue was #12940.
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