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Currently loops in the __index lookup are detected by restricting the lookup to a depth of 2000.
This can be removed by detecting loops instead of using a depth.
Using two iterators traversing the __index lookup chain. Therby one is faster (in this case twice) as the other. In case there is a loop the faster one will at some point catch up to the slower one. If this happens a loop was detected and an error can be raised.

The implementation can be found under