Fix Fixnum minus Bignum to not assume the result is a Bignum. Resolves #3316
Fix Fixnum minus Bignum to not assume the result is a Bignum.
Resolves #3316

lucaspinto/rubyspec,jannishuebl/rubyspec,eregon/rubyspec,benlovell/rubyspec,wied03/rubyspec,ruby/rubyspec,eregon/rubyspec,ruby/spec,lucaspinto/rubyspec,BanzaiMan/rubyspec,sgarciac/spec,wied03/rubyspec,iliabylich/rubyspec,kidaa/rubyspec,nobu/rubyspec,ruby/spec,kachick/rubyspec,sgarciac/spec,benlovell/rubyspec,kidaa/rubyspec,kachick/rubyspec,askl56/rubyspec,nobu/rubyspec,eregon/rubyspec,yous/rubyspec,iliabylich/rubyspec,sgarciac/spec,BanzaiMan/rubyspec,askl56/rubyspec,jannishuebl/rubyspec,nobu/rubyspec,kachick/rubyspec,yous/rubyspec,wied03/rubyspec,ruby/rubyspec,ruby/spec,bl4ckdu5t/rubyspec,bl4ckdu5t/rubyspec