Input String didn't parse as JSON. Surfaced only by the Json | String overloads; when the caller passes a Json directly this case cannot fire. The wrapped ParsingFailure carries circe's line/column diagnostics.
Human-readable diagnostic. Kept separate from toString so the default enum representation remains useful for structural inspection / pattern-matching-in-tests.
Human-readable diagnostic. Kept separate from toString so the default enum representation remains useful for structural inspection / pattern-matching-in-tests.