http://www.perlmonks.org?node_id=369478


in reply to Re^2: Quantum Weirdness and the Increment Operator
in thread Quantum Weirdness and the Increment Operator

By 'undefined', I think the traditional comp-sci meaning of "you may get anything or nothing" was meant. There's no telling what will happen, and whatever does happen may change over time as new compilers and libraries are implemented.