Correctly parse user GID #88
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Background
SSH3 can incorrectly store a user's UID as a GID instead. This PR fixes that bug.
The responsible line is
gid, err := strconv.Atoi(u.Uid).Changes
u.Gidinstead.strconv.ParseUintinstead to reduce the number of type conversions.Tests
go vet ./...andgo test ./...pass.