message: allow objects in first call to withSystemProps()
diff: @@ -48,9 +48,7 @@ export function withSystemProps(Component, props = COMMON) {
  throw new Error(`${Component.name} is already a system component; can't call withSystemProps() on it`)
  }
  - const component = (typeof Component === 'object')
  - ? Component
  - : {is: Component}
  + const component = typeof Component === 'object' ? Component : {is: Component}
  const Wrapped = system(component, ...props)
  Object.assign(Wrapped.propTypes, Component.propTypes)
  