[BUGFIX beta] Consistently use isStream helper.
Merge pull request #9913 from rwjblue/use-is-stream

[BUGFIX beta] Consistently use isStream helper.
[BUGFIX beta] Use dom helper for setting properties, drop hasOwnProperty
[BUGFIX beta] Swap nodeType for type check
[BUGFIX beta] Only start hydrating morphs if there are legacy childViews