[srean]

One of the most frustrating bugs I had encountered was when I was using memory mapped CSC format sparse arrays.

I needed the array indices to be int64 and specified them as such during initialization.

Downstreams, however, it would look at the actual index values and dynamically cast them to int32 if it judged there would be no loss in precision. This would completely screw up the roundtrip through a module implemented in C.

Being an intermittent bug it was quite a hell.