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Editorial: Clarify that "well-formed language tag" does not imply unicode_bcp47_locale_id well-formedness - #1048
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eemeli
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Oct 8, 2026
eemeli
approved these changes
Oct 8, 2026
…icode_bcp47_locale_id` well-formedness Fixes tc39#1046
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Fixes #1046
As noted there, "en-u-ca-buddhist-ca-islamic" and other inputs with duplicate
ukeys are accepted (and must continue to be). IsWellFormedLanguageTag therefore does not ensure conformance with the well-formedness constraints of aunicode_bcp47_locale_id, but rather with a slightly weaker set of constraints that are specific to ECMA-402 that this PR describes in a new note.