Hash should be cleaned when passed to Element.setStyles

[mattcoz]

The filter function in the Hash object causes problems in IE when a Hash is passed to the Element.setStyles function. This can be avoided by cleaning the Hash object.

setStyles: function(styles){
	if (Hash.type(styles)) styles = styles.getClean();
	for (var style in styles) this.setStyle(style, styles[style]);
	return this;
}

This also has the nice side effect of increasing performance.

[kamicane]

Passing an Hash to methods when you see object as type in the documentation is not supported.

If you need to pass hashes to methods that accept object as type, always clean it.