GitHub - tc39/proposal-is-usv-string: a proposal for a method to determine if a String is welll-formed Unicode

ECMAScript string values are a finite ordered sequence of zero or more 16-bit unsigned integer values. However, ECMAScript does not place any restrictions or requirements on the integer values except that they must be 16-bit unsigned integers. In well-formed strings, each integer value in the sequence represents a single 16-bit code unit of UTF-16-encoded Unicode text. However, not all sequences o

[efcl]

`String.prototype.isWellFormed()`と`String.prototype.toWellFormed()`のProposal。 USVString的な不完全なサロゲートペアが入ってないことを保証できるAPI