improved performance of Integer.undigits/2
improved performance of Integer.undigits/2

kelvinst/elixir,pedrosnk/elixir,antipax/elixir,joshprice/elixir,lexmag/elixir,pedrosnk/elixir,elixir-lang/elixir,kimshrier/elixir,antipax/elixir,gfvcastro/elixir,michalmuskala/elixir,beedub/elixir,lexmag/elixir,kimshrier/elixir,beedub/elixir,kelvinst/elixir,ggcampinho/elixir,gfvcastro/elixir,ggcampinho/elixir