Database#createFTS5Tokenizer API #944
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FTS5 doesn't support CJK symbols and non-latin locales in general. The easiest way to add them is to just use
Intlglobal object available in V8 to segment the UTF-8 string into words with ICU. This Pull Request adds the API to mapIntl.SegmenterAPIs into FTS5 as a custom tokenizer, or alternatively implement your own tokenizer from scratch.