in lib/src/scan.dart [61:70]
String expectQuotedString(
StringScanner scanner, {
String name = 'quoted string',
}) {
scanner.expect(_quotedString, name: name);
final string = scanner.lastMatch![0]!;
return string
.substring(1, string.length - 1)
.replaceAllMapped(_quotedPair, (match) => match[1]!);
}