Original ticket http://projects.scipy.org/numpy/ticket/988 on 2009-01-22 by trac user kelson, assigned to unknown.

Howdy,

After searching for this defect, perhaps nobody else has been bothered
by this behaviour, but has anybody else noticed:

concatenate ( [[1],[2],[3],[4]] ).dtype = int32

concatenate ( [[1],[2],[3],[]] ).dtype = int32

concatenate ( [[],[2],[3],[4]] ).dtype = float64

I have a lot of old-style Numeric stuff that likes to concatenate lists
of indices which then were used with take [which does not like floats]. So
below [in theory] I attach my attempt at a patch so that empty items in the sequence are
not used to influence the common type that is used by PyArray_ConvertToCommonType.

Maybe it is of some value, or maybe I didn't do this in a kosher manner and
someone else has an idea of where things should be rethought for this defect?

Cheerio.