> A bunch of neato things such as build-your-own-sigils, which felt even more "Ruby-like" than Ruby's own capability

I like custom sigils, those are pretty cool, e.g. def sigil_i(string, []), do: String.to_integer(string)

But, having to put that char into the method name rather than argument, doesn't that limit the characters that you can use? Seems like would be better as arg.