In order to have a better guarantee of node flags, etc... we need to have an argument indicating what kind of insertion mutation and happened to insertedInto.
Created attachment 324102 [details] Cleanup
Created attachment 324105 [details] Cleanup
Comment on attachment 324105 [details] Cleanup r=me
Committed r223628: <https://trac.webkit.org/changeset/223628>
<rdar://problem/35060952>