Ember Twiddle

Ember Twiddle doesn't let me go above 3.4, but I'm reproducing this on a 3.10 app (during a migration from 2.18).

This is less of a bug and more of something that could have a helpful debug assertion. Maybe something like:

You passed [Object object] to the {{component}} helper, but the component helper only accepts strings or other components.

Along with maybe a log of what that object was.

(This might not be the right repo for this, since it seems to deal with glimmervm internals)