1 Set KEEP on constant split
2 Optimize foreach on array.
3 Execute all BEGINs and ENDs.
4 Make a good way to determine if *.pl is being executed directly.
5 Make specialized allocators.
15 make tr/// return histogram in list context?
16 Do anything with "hint"?
17 When does split() go to @_?
18 undef wantarray in void context?