Minor bug: recursive Thread.current[:__inspect_key__]?

Moin.

Here is some odd border case behavior I have stumbled upon:

> irb(main):001:0> x = []; x << x; Thread.current[:__inspect_key__] = x
> => [[...], 23694880]                                                 
> irb(main):002:0> x.size                                              
> => 1                                                                 

It seems pretty harmless, but is probably best fixed anyway.

Also, it is possible to freeze the inspect key array which will then 
result in an exception from Object#inspect -- I could however not cause 
a segfault so it is probably safe.

Regards,
Florian Gross