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Drop old support and use ES2015 features to reduce filesize and make better peformance #83

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@cyfung1031 cyfung1031 commented Jan 1, 2024

  • native optional arguments instead of arguments copying by coding
  • ES2015 Map; map.delete(key) is much faster than delete object[key]
  • read event.data once and use startsWith(...) instead of indexOf(...) === 0
  • drop IE support (IE is already dead!)

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