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Wrapping errors instead of merely embedding error messages allows calling code to use
errors.Is
anderrors.As
to more precisely check the reasons for various errors instead of having to rely only on substring searches.Fixes #503
Since error-wrapping was only introduced in Go 1.13, accepting this PR would involve dropping support for 1.11 and 1.12 (and even earlier, if the readme's claim of supporting all the way back to 1.7 is still accurate). I realize that may jeopardize this PR because it's definitely not a change to make lightly.