Add warnings about UTF-16 vs UTF-8 strings #1416
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Pauan
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👍 Thanks for the thorough review! |
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This commit aims to address rustwasm#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 rustwasm#1348
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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_stringand handlingof arguments is lossy when there are lone surrogates.
A
JsString::is_valid_utf16method was added to test whetheras_stringis lossless or not.The intention is that most default behavior of
wasm-bindgenwillremain, but where necessary bindings will use
JsStringinstead ofstr/Stringand will manually check foris_valid_utf16asnecessary. It's also hypothesized that this is relatively rare and not
too performance critical, so an optimized intrinsic for
is_valid_utf16is not yet provided.
Closes #1348