'selector instanceof List' can break resusability across distributed components

[btknorr]

When you have components that don't reside in the same place (ie github) and depend on component/dom, this line of code can break reuse. We ran into this today. 'selector instanceof List' forces every single distributed component to use the exact same version of dom, which is very unlikely. Is there another way you can determine if a selector is a List?