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44738e049a
This commit aims to address #1348 via a number of strategies: * Documentation is updated to warn about UTF-16 vs UTF-8 problems between JS and Rust. Notably documenting that `as_string` and handling of arguments is lossy when there are lone surrogates. * A `JsString::is_valid_utf16` method was added to test whether `as_string` is lossless or not. The intention is that most default behavior of `wasm-bindgen` will remain, but where necessary bindings will use `JsString` instead of `str`/`String` and will manually check for `is_valid_utf16` as necessary. It's also hypothesized that this is relatively rare and not too performance critical, so an optimized intrinsic for `is_valid_utf16` is not yet provided. Closes #1348