[Numpy-discussion] Re-enable deprecation warning for "ragged arrays"

[Matti Picus]

A few months ago we merged an implementation of "NEP 34 - Disallow 
inferring dtype=object from sequences" 
https://numpy.org/neps/nep-0034.html but it broke downstream packages 
like scipy, pandas, matplotlib, astropy (those are the ones we know 
about). Since then, the downstream projects seem to have fixed the 
problematic code. We have re-merged the implementation. Please check 
your package against the latest NumPy HEAD and let us know if there are 
problems.


Matti