text: Title: Boolean attributes in button: disabled
  Body: Hello.
  
  I'm trying to use [the `disabled` attribute](https://www.w3schools.com/Tags/att_button_disabled.asp) in the button element.
  
  Firstly, I've noticed that its type is String instead of Boolean.
  Secondly, I've trying to set the prop disabled='disabled', but it does not work; and it is still enabled.
  
  Other props of button with expected similar behaviour (boolean props) are: autoFocus, contentEditable, draggable, hidden, spellCheck, etc.