We're shadowing type='submit' for <button> because type is used to declare primary, secondary, and so on.

We should either rename type to something else such as hue='danger', or add a submit prop that results in <button type='submit'>.

Both approaches have their pros and cons. type fits the button "roles" very well, role would also clash with aria props, etc. At the same time, submit={ Boolean } wouldn't fix support for <button type='button'> either.