BTW, I'm not saying D can't do anything like this
enum Dir { Left, Right, Both }
string strip(Dir dir = Dir.Both)(string s)
but one has to call it like
strip!(Dir.Left)(s); (or if using strings, strip!"Left"(s))
Possibly, to make it easier the compiler and localize the enum if
one is used:
strip!Left(s); // compiler changes to strip!(Dir.Left)(s)
