Hey, so I ignored trying to redo MapIter (likely it is lobotomized at this time though). But actually got a working new index parsing (still needs cleanup, etc.). Also some of the fast paths are not yet put back. For most pure integer indices it got a bit slower, if it actually gets too much one could re-add such special cases I guess... If anyone wants to take a look, it is here: https://github.com/seberg/numpy/compare/rewrite-index-parser The tests run through fine with the exception of the matrix item setting [1] and changes in errors. Certainly many errors still need to be made indexing specific. If anyone is interested in messing with it, give me a ping for direct access. Polishing such a thing up (if deemed right) is a lot of work and I am not sure I will find the time soon. Regards, Sebastian [1] That is because subclass item setting (for non-fancy, non-scalar result and non-single integer indices) is really tmp = subclass.view(np.ndarray) tmp[index] = values` which needs to be put back in. The whole matrix indexing business probably needs some extra functionality in the core to get right I guess.