message: Double equals
diff: @@ -161,7 +161,7 @@ export default class Field extends React.PureComponent {
  prefixContainer = <span className="mx_Field_prefix">{prefix}</span>;
  }
  - const hasValidationFlag = flagInvalid != null && flagInvalid !== undefined;
  + const hasValidationFlag = flagInvalid !== null && flagInvalid !== undefined;
  const fieldClasses = classNames("mx_Field", `mx_Field_${inputElement}`, {
  // If we have a prefix element, leave the label always at the top left and
  // don't animate it, as it looks a bit clunky and would add complexity to do
  