rgba.js
function rgba(r, g, b, a) {
	return new RGBA(r, g, b, a);
}
function rgba(r, g, b, a) {
	return new RGBA(r, g, b, a);
}
function rgba ( r , g , b , a ) { return new RGBA ( r , g , b , a ) ; }
We want the underlying RGBA type to be an implementation detail
We want the underlying RGBA type to be an implementation detail