In zope/configuration/ it seems that it isn't being
asserted that no previous registration of a directive with the same
name has happened.

This might be desirable (not sure why) and currently happens for these

('', u'directive')
('', u'groupingDirective')
('', u'complexDirective')
('', u'securityPolicy')

This is on Zope 2.10.

So for instance, if Five registers the <browser:viewlet> then there's
nothing to prevent another package from including zope.viewlet's
meta.zcml which will then override that directive, breaking viewlet
support on Zope 2.10.

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