I like it much better than the operator version, if I understand correctly,
it's like a watcher for special value, that monitor the stack.
Danger is that it monitor the whole stack, so that final result is dependent on
how much you decompose your algorithm into nested fiction calls: all return
values will be monitored, and only return values...
But if you refactor a big function into nested functions, and happen to return
the special value in the new subfunctions, it will have side effects, that can
not be known within the context: it expose internals that used to be hidden,
deliberately so...
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