That's interesting, I like how `slice` lets you concat sequences of arguments, but worry about building functions which have too many convenience features. Thought experiment: what if I wanted to pass every other argument?
# Adapted from http://autotelicum.github.com/Smooth-CoffeeScript/literate/partial.html
F.partial = (func, a...) -> (b...) ->
func (for arg in a then arg ?= b.shift())..., b...
function(arg, i){ return i%2 }