Unable to set AOM properties on anchor tags

[davidturissini]

Description

Setting AOM properties imperatively throws TypeError: Invalid value used as weak map key. This is because tags have a host property which is what we use to determine if a value is an element or shadow root.

Steps to Reproduce

1. Create a component that renders an anchor
2. Get a reference to the anchor
3. imperatively set ariaChecked = 'true';

expected:
No error

actual:
Weak map error