Number input never renders the placeholder #144

It seems impossible to see the placeholder for the <Number /> input element.

Whenever initialValue/defaultValue props are passed 0, null, undefined or even "" values the value="0" HTML attribute is always rendered.

The only solution for displaying the placeholder is passing value="" prop, but obviously the prop doesn't use the built-in onChange handling then and becomes non-editable.

<Number
  name="somename"
  placeholder={"Test placeholder"}
/>