bugfix: Is should return false when called without codes #59
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Fixes #58
This change ensures that calling Is(err) without passing any code arguments returns false. Previously Is(err) would always return true, because PrefixMatches treats empty code as a match.
The fix adds an early guard
if len(code) == 0 { return false }at the start of Is. New tests have been added to assert this behavior, including nested/unwrapped errors. All existing tests continue to pass.