add NaN + Infinity checking to Fixnum+Bignum
add NaN + Infinity checking to Fixnum+Bignum

- this might not be necessary...

kou/ffi-yajl,h4ck3rm1k3/ffi-yajl,h4ck3rm1k3/ffi-yajl,h4ck3rm1k3/ffi-yajl,chef/ffi-yajl,kou/ffi-yajl,chef/ffi-yajl,chef/ffi-yajl,kou/ffi-yajl