I need to add a DateTime field to my primary content object. Unfortunately, in Zope 3, they named it Datetime in zope.schema. Now, before you say I should notice the coding standards, please note that the single textline object is zope.schema.TextLine.
Figuring out this one took me way too long for comfort.
This is the first time I've seen this sort of mistake in Zope 3. Until now I've been delighted with Zope 3's consistency and elegance.
I'm hoping it will be a while before I find the same sort of thing again.