Function HasIsolatedSurrogate

deps/v8/test/mjsunit/wasm/stringrefs-exec-gc.js:59–65

(str)

  return 0xD800 <= codepoint && codepoint <= 0xDFFF
}
function HasIsolatedSurrogate(str) {
  for (let codepoint of str) {
    let value = codepoint.codePointAt(0);
    if (IsSurrogate(value)) return true;
  }
  return false;
}
function ReplaceIsolatedSurrogates(str, replacement='\ufffd') {
  let replaced = '';
  for (let codepoint of str) {