1) Composite time trait children with NaN properties not propagating to the parent as NaN.
2) Serial seek trait's canSeekTo inappropriate returning false for canSeekTo(duration) and true when attempting to seek past an unseekable child.
Both issues discovered while testing the (soon to be checked in) fix for FM-719, based on the test case of a SerialElement with multiple DurationElements in parallel with a VideoElement (soon to be added to ExamplePlayer).