assert if subtype has same event as parent; don't pass down static "events" onto subtype, https://github.com/phetsims/phet-io/issues/1341
assert if subtype has same event as parent; don't pass down static "events" onto subtype, https://github.com/phetsims/phet-io/issues/1341

phetsims/tandem,phetsims/tandem,phetsims/tandem