p class="shortcomment cmt">returns the current value of this Signal.</p><div class="fullcomment"><div class="comment cmt"><p>returns the current value of this Signal.
It's generally better to use composition methods like Functor#map, Cartesian#product
ReactiveLibraryUsage#SignalExtensions[A]#triggerWhen[B](Event[B]):Event[A]*  and similar methods.
It should also be avoided to use now inside of any of these methods since the current value
of a signal could be in an inconsistent state
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