add back deepContains (got removed incorrectly in merge).
add back deepContains (got removed incorrectly in merge).

MartinsThiago/polymer,JeremybellEU/polymer,mgiuffrida/polymer,gazal-k/polymer,gronke/polymer,ikeagold/polymer,ktiedt/polymer,JeremybellEU/polymer,Endika/polymer,Polymer/polymer,Polymer/polymer,gronke/polymer,MartinsThiago/polymer,yforrest/polymer,ktiedt/polymer,JeremybellEU/polymer,jordanyaker/polymer,mgiuffrida/polymer,gazal-k/polymer,exlerdesigns/polymer,MartinsThiago/polymer,gronke/polymer,tjsavage/polymer,Endika/polymer,jordanyaker/polymer,Endika/polymer,tjsavage/polymer,ktiedt/polymer,tjsavage/polymer,yforrest/polymer,Polymer/polymer,exlerdesigns/polymer,ikeagold/polymer,gazal-k/polymer,exlerdesigns/polymer,ikeagold/polymer,mgiuffrida/polymer,jordanyaker/polymer,yforrest/polymer