createMaxLengthConstraint fails on undefined or null

[kf6kjg]

To me it seems intrinsic that the length of an undefined or null value is less than any maximum given.

Does this make sense to you? I can create a patch if you are interested, but it's a really simple change to constraints.js:

function createMaxLengthConstraint(maxLength) {
  var message = arguments.length <= 1 || arguments[1] === undefined ? null : arguments[1];

  return (0, _createConstraint2.default)(function (value) {
    return typeof value === "undefined" || value === null || value.length <= maxLength; // if the value is undefined or null, then it is already known to be shorter than required.
  }, message || 'Value length is more than ' + maxLength);
}

[vslinko]

You are right, it makes sense. Those constraints should work only when value is defined.

It will be great to merge a PR that fixes this.