Fix drop_start on JavaScript for multi-byte strings#925
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`string_byte_slice` used `String.prototype.slice`, which operates on UTF-16 code units, but it is called with UTF-8 byte offsets from `byte_size`. Encode to UTF-8, slice the byte array, then decode back.
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string_byte_sliceusedString.prototype.slice, which operates on UTF-16 code units, but it is called with UTF-8 byte offsets frombyte_size. Encode to UTF-8, slice the byte array, then decode back.This is a simple fix, but there is a downside: the string param to
drop_startwill be encoded to UTF-8 twice, once forbyte_sizeand again forstring_byte_slice. A better path might be to liftdrop_startto a native implementation in JS.Closes #924