Remove manual type-casting as Ruby will do it internally anyway.
Remove manual type-casting as Ruby will do it internally anyway.

This is another re-factor for speed. We want to get the most out of
Fixnum by using native types, and then when Bignum is requested then
just deal with it appropriately.

Signed-off-by: Krzysztof Wilczynski <9bf091559fc98493329f7d619638c79e91ccf029@linux.com>

kwilczynski/ruby-fizzbuzz,kwilczynski/ruby-fizzbuzz,kwilczynski/ruby-fizzbuzz