Proper (Unicode) exponents in Perl.
That is, I want to be able to write 22, 4137, 3-9, etc. and have Perl understand them.
For Perl 5, I suspect someone would use a source filter to implement it.
For Perl 6, PerlJam++ suggested introducing each of the exponents as postfix operators, using this example for squaring:
our &postfix:<2> := &infix:<**>.assuming(b => 2);But then a negative exponent would complicate things a bit.
It's a thought, anyway, and not one that I'd want to distract more pressing implementation concerns.
And ifwhen someone decides that this is a good idea to have in the language core, I'll start nagging about Knuth's up-arrow notation. Not that I'd want anyone attempt calculating 4↑↑↑↑4.