So I guess Perl is a gateway drug for the APL family of languages now?
# use the reduce metaoperator [ ] with infix + to do "sum all"
[+] 1, 2, 3 say [+] 1..10000000000000000000000000000000000000000000
Which will result in you getting this back in a fraction of a second50000000000000000000000000000000000000000005000000000000000000000000000000000000000000
(It actually cheats because that particular operator gets substituted for `sum` which knows how to calculate the sum of a Range object.)