try inheritance numeric
* coerce
* i
* <=>
* +@
* -@
* hash
* eql?
* to_f
* fdiv
* div
* divmod
* modulo
* remainder
* floor
* abs
* to_int
* real?
* integer?
* zero?
* nonzero?
* ceil
* round
* truncate
Merge pull request #1 from ksss/numeric

Numeric