objectSignals: Observer Pattern for S4
A mutable Signal object can report changes to its state,
clients could register functions so that they are called whenever
the signal is emitted. The signal could be emitted, disconnected,
blocked, unblocked, and buffered.
||R (≥ 2.12)
||Michael Lawrence, Tengfei Yin
||Michael Lawrence <michafla at gene.com>
||GPL-2 | GPL-3 [expanded from: GPL (≥ 2)]
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