Sure could be implemented, start here: https://github.com/espruino/Espruino/blob/a2fb33f01af8bc2a33f9d86a176eb18ecf50635a/targets/esp8266/jshardware.c#L882-L926
What is a simple & cheap device that does clock stretching? I wouldn't know how to test it if I implemented it (one reason I didn't).
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