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The bundled highlight.js language grammar definitions have been updated. Language definitions now use the modern scope/match API instead of the older className/begin/end API for improved accuracy and consistency. Plugin-provided hljs grammars are now also watched in worker mode (hljsLanguages added to the worker config watcher).
Evidence
Grammar modules updated (search for "scope: \"attribute\"" in the Augmented BNF grammar) and watcher flag (search for hljsLanguages in the config object)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.