xhtml script setSrc() doesn't convert to a valid URL to a browser

Steps to Reproduce

1. load the attached zul
2. click the button

Current Result

invalid or unexpected token

Expected Result

Debug Info

au response:
{"rs":[["setAttr",[{$u:'myscript'},"dynamicProperty",["src",[email protected]]]]],"rid":1}

Root Cause

else if ("src".equals(name)) {
			// ZK-3011: should defer until render
			EncodedURL url = new EncodedURL(sval);
			setDynaProp(name, url);
			smartUpdate("dynamicProperty", new Object[] { name, url }, true);
			return;

Workaround