On Thu, Apr 03, 2014 at 02:40:25PM +0000, R David Murray wrote:
> 
> Note that in Python3 there are a lot more datatypes where sorts
> including None will fail, so long term the issue is about more than just
> datetimes.

I know. There currently is a mechanism for mangling to-be-sorted items
before sorting. It just wasn't called when sorting in python for rdbms
backends. I've fixed this now.
I don't think this already works for python3 but should be easy to fix
by fixing the "sort_repr" methods of the various hyperdb types (e.g.
String, Multilink, Date, etc.)

Fixed in ra116de39e38c

Concerning the original bug-report, just for the records: This also
failed for mysql not just PostgreSQL.

Ralf
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