Allow compatibility with BasicObject and descendants.

[griffindy]

If you try to use AllocationStats.trace and any descendant of BasicObject (but not Object) is created during the block, it will fail from calling object_id and send. BasicObject does not implement those two methods, but does use __id__ and __send__.

That was a simple refactor. The slightly more complicated problem is that BasicObject#class does not exist. I found a way to implement #class by referencing the superclass of a BasicObject's eigenclass.

Let me know if there's anything else you want me to add to the pull request.

• use #__id__ instead of #object_id
• use #__send__ instead of #send
• monkey patch BasicObject to give it #class using this hack found here: http://stackoverflow.com/a/10216927

[srawlins]

Thanks for the PR! specs look good. I'm thinking of adding a spec for your case. Out of curiosity, what Basic Object descendants were involved when you found this bug?

[griffindy]

I can add the spec if you want, though I imagine you have your own system set up.

I happened across this while trying to profile something using sidekiq. Specifically, Redis::Future is a BasicObject, not really sure why.

[srawlins]

LGTM. I'll write a spec as well.