Switch from :track and :untrack events, which are unrecognized, to replica events which are recognized#128

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jesseshieh wants to merge 3 commits intobitwalker:masterfrom

jesseshieh:js/unrecognized-cast-track

Commits on May 14, 2019

Remove unused casts. All tests still pass. Not sure if they are unused or if they should be calls instead of casts.
Jesse
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Revert "Remove unused casts. All tests still pass. Not sure if they are unused or if they should be calls instead of casts."
Jesse
committed
Switch from :track and :untrack events, which are unrecognized, to replica events which *are* recognized.
Jesse
committed