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TextDecoder is missing x-user-defined encoding #6039
Description
It should be there per spec
It's a simple single-byte encoding despite its name
Can be treated as a single-byte or algorithmic
The usecase for that is old compat loading of binary data over strings, as it can be then decoded easily (and TextDecoder does not expose isomporhic, and latin1 maps to windows1252 and is actually non-isomporhic and complex to decode back to bytes).
Activity
JosephDoUrden commentedon Feb 7, 2026
I’ll take a look at this and report back shortly
feat(textdecoder): add x-user-defined encoding support
Use simdutf::validate_ascii for x-user-defined fast path (fixes cloud…
Merge pull request #6040 from JosephDoUrden/fix/textdecoder-x-user-de…