Named method arguments

[theodorton]

Assume the following code:

def fn(arg_a, arg_b, arg_c)
  ...
end

fn(1, 2, 3)
fn(1, 2, arg_a: 3)
fn(arg_a: 1, arg_b: 2, arg_c: 3)
fn(arg_c: 1, arg_b: 2, arg_a: 3)

JavaScript has no concept of named arguments. An object argument would of course be possible, but that would leave out the first and second variant. I don't want to litter the function definitions with too much new code, but I'm not sure there are any other options.

[theodorton]

Setting milestone to 1.1.0 as this is out of scope when running Crystal in isolation.