Fix for Ruby 2.4.0 integer unification #13
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As of Ruby 2.4.0, Fixnum and Bignum have been unified into the Integer type. So rb_cFixnum is no longer defined. Fortunately, ruby.h defines RUBY_INTEGER_UNIFICATION if rb_cFixnum is no longer available, so we can check that.
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As of Ruby 2.4.0, Fixnum and Bignum have been unified into the Integer type. So rb_cFixnum is no longer defined. Fortunately, ruby.h defines RUBY_INTEGER_UNIFICATION if rb_cFixnum is no longer available, so we can check that.