15.4.4.5 Array.prototype.join

[James Graham]

I may be missing something obvious but I can't see where 
Array.prototype.join prevents unlimited recursion in code like:

a = [1,2]
a.push(a)
a.toString()
(implementations seem to give "1,2," as output in this case).

Also, step 9 of the algorithm in the current draft appears to be blank.
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