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Would it be too hard to just compare arbitrary slices and arrays based on the contents of said data structures? Converting arbitrary bytes to strings should fail at least some times, since not all byte sequences are valid UTF-8, and afaiu, in Go, the string type should always contain valid UTF-8.

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Go strings do not need to contain valid UTF-8, although in practice they usually do. A 'range' loop over a string will loop over its UTF-8 codepoints, but in general, a string can contain arbitrary binary data. See https://golang.org/pkg/builtin/#string

I thought strings in Go could contain arbitrary byte sequences?

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