That's a horrible hack indeed :) Perl 6 does have 'gradual typing' though. You can define a variant: my $foo; or a typed variable: my Int $foo; or a su

That's a horrible hack indeed :) Perl 6 does have 'gradual typing' though. You can define a variant: my $foo; or a typed variable: my Int $foo; or a subtype with arbitrary restrictions subset OneToTen of Int where { 1 <= $^n <= 10 }; my OneToTen $foo; Or... (http://rosettacode.org/wiki/Define_a_primitive_data_type#Perl_6 http://rosettacode.org/wiki/Define_a_primitive_data_type#Per...) subset Prime of Int where { $^n > 1 and $^n %% none 2 .. sqrt $^n }; Perl 6 scares me.