code: function isInvalidXmlChar(code) {
    if (typeof code == "string")
      code = code.charCodeAt(0);
    return (code >= 0x1 && code <= 0x8) ||
      (code >= 0xB && code <= 0xC) ||
      (code >= 0xE && code <= 0x1F) ||
      (code >= 0x7F && code <= 0x84) ||
      (code >= 0x86 && code <= 0x9F) ||
      (code >= 0xFDD0 && code <= 0xFDDF) ||
      (code % 0x10000 == 0xFFFE) ||
      (code % 0x10000 == 0xFFFF);
  }
docs: /* ## Utility stuff