function validatePropertyKey(name, element, parentType) {
	  if (!NUMERIC_PROPERTY_REGEX.test(name)) {
	    return;
	  }
	  warnAndMonitorForKeyUse(
	    'Child objects should have non-numeric keys so ordering is preserved.',
	    element,
	    parentType
	  );
	}
Warn if the key is being defined as an object property but has an incorrect
value.

@internal
@param {string} name Property name of the key.
@param {ReactElement} element Component that requires a key.
@param {*} parentType element's parent's type.