I must say I've still not read all apocalypses, and OTOH I suspect that
this could be done more or less easily with a custom function (provided
that variables will have a method to keep track of their history, or, more
reasonably, will be *allowed* to have it), but I wonder if Perl6 may
include a builtin undo() function to recover values prior, say, to the
last assignement (or push() or, etc. etc.[*])
For optimization reasons track of a variable's "history" may be kept only
[*] To be definite, any atomic value-changing expression or statement, for
Just my 2 cents,
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