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BEAKING CHANGE:
Lazy-binding now happens on the scope watcher level.
What this means is that given `parseFn = $parse('::foo')`,
bind-once will only kick in when `parseFn` is being watched by a scope
(i.e. `scope.$watch(parseFn)`)
Bind-once will have no effect when directily invoking `parseFn` (i.e. `parseFn()`)