This is a bug-fix release, primarily to resolve several issues with the semantic-enrichment and speech-generation code that could loop infinitely in some cases, leading MathJax to crash. In particular:
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Several regressions within the speech-rule engine, mostly involving empty bases for super- or subscript, or initial spaces within expressions, were resolved.
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A performance issue with speech generation for large flat expressions was resolved.
See the release notes for the list of other bugs that have been fixed in this version.