• For others, this is now reported in the Espruino bug tracker: https://github.com/espruino/Espruino/iss­ues/1866

    Espruino was originally only designed with ASCII in mind, so this doesn't work with char codes >127

    It shouldn't be too hard to fix, and for now you could actually overwrite String.prototype.toUpperCase with a JS version if you need it in a hurry


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