Function innerDeepEqual

lib/internal/util/comparisons.js:238–269

(val1, val2, mode, memos)

}

function innerDeepEqual(val1, val2, mode, memos) {
  // All identical values are equivalent, as determined by ===.
  if (val1 === val2) {
    return val1 !== 0 || ObjectIs(val1, val2) || mode === kLoose;
  }

  // Check more closely if val1 and val2 are equal.
  if (mode !== kLoose) {
    if (typeof val1 === 'number') {
      // Check for NaN
      // eslint-disable-next-line no-self-compare
      return val1 !== val1 && val2 !== val2;
    }
    if (typeof val2 !== 'object' ||
        typeof val1 !== 'object' ||
        val1 === null ||
        val2 === null) {
      return false;
    }
  } else {
    if (val1 === null || typeof val1 !== 'object') {
      return (val2 === null || typeof val2 !== 'object') &&
             // Check for NaN
             // eslint-disable-next-line eqeqeq, no-self-compare
             (val1 == val2 || (val1 !== val1 && val2 !== val2));
    }
    if (val2 === null || typeof val2 !== 'object') {
      return false;
    }
  }
  return objectComparisonStart(val1, val2, mode, memos);
}

function hasUnequalTag(val1, val2) {
  return val1[SymbolToStringTag] !== val2[SymbolToStringTag];