Finally, I got it!
In the inside of Hash.initialize Object.clone is called:
var Hash = Class.create(Enumerable, (function() {
function initialize(object) {
if(typeof object == 'undefined'){alert(arguments.callee)}
this._object = Object.isHash(object) ? object.toObject() :
Object.clone(object);
}
..cut..
}
.. and it takes an empty object literal to extended it with all the
properties of the source object:
function clone(object) {
return extend({ }, object);
}
So, there is a returned "empty" object literal even if Hash.initialize is
called without the expected "object" argument just like in
Element.Layout.initialize.
This is NOT AT ALL an intuitive solution and can only create much
confusion about how Class creation works in Prototype. The transparent (
commonly used ) solution is to default the object argument to an empty
object literal in the inside of Hash.initialize:
function initialize(object) {
if(Object.isUndefined(object)){ object = {};}
this._object = Object.isHash(object) ? object.toObject() :
Object.clone(object);
}
Thanx guys!
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