Should the autocompletion extension ignore input while composing?

When typing using an input source on macOS like “Pinyin - Simplified” or “Japanese - Romaji”, the characters typed while the IME is open are entered into the document, which triggers the autocompletion menu to open.

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Would it make sense for the autocompletion extension to ignore characters entered while composition is in progress?

Maybe in some cases, but I don’t think it would in general. CodeMirror 5 worked this way, and I had several users explicitly request that autocompletion activate for partial composition.