Island.Add gets called when it clearly shouldn't (r59)

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What steps will reproduce the problem?

1. I'm not entirely sure; it occurs in r59 (the last "stable" revision of 
the code), but not in r72. It happens spontaneously, without visible 
provocation.


What is the expected output? What do you see instead?

Island.Add tries to add a Body to _bodies beyond the bounds of the array. 
More bizarre than that, the Assertion at the beginning of the method 
doesn't trigger, even though the condition is Clearly false (3 is not less 
than 2...).


What version of the product are you using? On what operating system?

I'm using r59 on Windows XP SP2.


Please provide any additional information below.

None that I know of.

Original issue reported on code.google.com by mcacrylamide@gmail.com on 22 Sep 2009 at 12:11