[Zope-dev] z3c.saconfig engine creation configuration

[Malthe Borch]

Laurence Rowe wrote:
> I would rather we did not hardcode the defaults from SQLAlchemy into the 
> engine directive (I guess they could change in future). Instead use a 
> default of None and only supply the parameter if the config option is set.

Sounds right to me. Attached is an update patch.

\malthe
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