Find the first byte offset where observed and expected diverge
under the hex-case policy, or -1 if they match. Offsets are in
characters of the encoded string (not decoded bytes), suitable for
error reports that need to point at the offending percent-triplet.
Find the first byte offset where
observedandexpecteddiverge under the hex-case policy, or-1if they match. Offsets are in characters of the encoded string (not decoded bytes), suitable for error reports that need to point at the offending percent-triplet.