On Wed, 13 Apr 2016 15:49:15 -0600 Charles R Harris <charlesr.har...@gmail.com> wrote: > > I looked this up once, `C` returns unsigned in the scalar case when both > operands have the same width. See Usual Arithmetic Conversions > <https://www.securecoding.cert.org/confluence/display/c/INT02-C.+Understand+integer+conversion+rules>. > I think that is not a bad choice, but there is the back compatibility > problem, plus it is a bit exceptional.
It may be a worse choice for Python. In the original use case (indexing with an integer), losing the sign is a bug since negative indices have a well-defined meaning in Python. This is a far more likely issue than magnitude loss on a 64-bit integer. In Numba, we decided that combining signed and unsigned would return signed (see http://numba.pydata.org/numba-doc/dev/proposals/integer-typing.html#proposal-predictable-width-conserving-typing). Regards Antoine. _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org https://mail.scipy.org/mailman/listinfo/numpy-discussion
