Regarding

JavaScript hosts might additionally provide:

STRING | Converts the next two arguments from a pair of i32s to a utf8 string. It treats the first as an address in linear memory of the string bytes, and the second as a length.

Any chance that there'll be support for JS-style strings (UTF-16LE) as well? I know this doesn't really fit into the C/C++ world, but languages approaching things the other way around will most likely benefit when not having to convert back and forth on every host binding call.