That section reminded me of how constants are implemented via functions in Perl e.g. use constant PI => 4 * atan2(1, 1); under the hood becomes sub PI ()

That section reminded me of how constants are implemented via functions in Perl e.g. use constant PI => 4 * atan2(1, 1); under the hood becomes sub PI () { 4 * atan2 1, 1 } http://perldoc.perl.org/constant.html#TECHNICAL-NOTES http://perldoc.perl.org/constant.html#TECHNICAL-NOTES