So is the consensus that we don't accept any tags at all (not even temporarily)? Would that break too much existing code?

Cheers,

Sankarshan

On Apr 1, 2014, at 2:50 PM, Alexander Belopolsky <ndarray@mac.com> wrote:

On Tue, Apr 1, 2014 at 1:12 PM, Nathaniel Smith <njs@pobox.com> wrote:

In [6]: a[0] = "garbage"
ValueError: could not convert string to float: garbage

(Cf, "Errors should never pass silently".) Any reason why datetime64
should be different?

datetime64 is different because it has NaT support from the start.  NaN support for floats seems to be an afterthought if not an accident of implementation.

And it looks like some errors do pass silently:

>>> a[0] = "1"

# not a TypeError

But I withdraw my suggestion.  The closer datetime64 behavior is to numeric types the better.

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