message: Ensure we always set some value in Field
  Always set some value on the Field's input so that it doesn't flip flop between
  controlled and uncontrolled.
diff: @@ -88,8 +88,8 @@ export default class Field extends React.PureComponent {
  inputProps.onChange = this.onChange;
  // make sure we use the current `value` for the field and not the original one
  - if (this.value != undefined) {
  - inputProps.value = this.value;
  + if (inputProps.value === undefined) {
  + inputProps.value = this.value || "";
  }
  const fieldInput = React.createElement(inputElement, inputProps, children);
  