TypeError: Attempting to configurable attribute of unconfigurable property.

[Bor1s]

Hello guys!

I'm using polymer 0.5.3 and core/paper components 0.5.3.
I've got an error in Safari (8.0.2), Mobile Chrome (IPad), Mobile Safari (IPad) that causes something on
webcomponents.js:317 - defineProperty.

function defineGetter(constructor, name, getter) {
      getterDescriptor.get = getter;
      defineProperty(constructor.prototype, name, getterDescriptor);
    }

After debug, I found out that it fails with:
constructor.prototype -> GeneratedWrapper
name -> ownerSVGElement
getterDescription -> Object({configurable: true
enumerable: true})

[miztroh-zz]

I get the same issue in Safari 7.1.2 on Mavericks (10.9.5).

[arthurevans]

0.5.4 is now out. It's the same as 0.5.3 except it reverts the problematic change.

Please update.