[Numpy-discussion] correct sizeof for ndarray

[Jason Newton]

Hi folks,

I noticed an unexpected behavior of itemsize for structures with offsets
that are larger than that of a packed structure in memory.  This matters
when parsing in memory structures from C and some others (recently and
HDF5/h5py detail got me for a bit).

So what is the correct way to get "sizeof" a structure?  AFAIK this is the
size of the last item + it's offset.  If this doesn't exist... shouldn't it?

Thanks,
Jason
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