Possible polyfill bug

[guybedford]

I just noticed this line in the polyfill - https://github.com/WebAssembly/js-string-builtins/blob/main/test/js-api/js-string/polyfill.js#L150

    if (startIndex > string.length,
        endIndex > string.length,
        endIndex < startIndex) {
      return "";

Seems like this should probably be:

    if (startIndex > string.length ||
        endIndex > string.length ||
        endIndex < startIndex) {
      return "";

Since , expressions in JS only return their last value, making the first case only if (endIndex < startIndex) {.