Fix assertion about the class of Object#object_id
#56
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In Ruby 2.4, `Fixnum` and `Bignum` were unified into `Integer` and the "bigness" of that integer became an internal implementation detail. Because the koans support some pretty old rubies, we can't make a universal assertion about the class of `Object.new.object_id`, but it always `is_a? Integer`.
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I'm not sure whether this project is currently being maintained, but I have a few improvements I'd like to offer. I figured I'd start with this one since it's a one-line change.
In Ruby 2.4,
FixnumandBignumwere unified intoIntegerand the "bigness" of that integer became an internal implementation detail. Because the koans support some pretty old rubies, we can't make a universal assertion about the class ofObject.new.object_id, but whatever the class, it alwaysis_a? Integer.