Plone 4.3.4 RuntimeError: maximum recursion depth exceeded

another one: package running tests normaly under Plone 4.3.3; after new 
Plone 4.3.4 release, bunch of "maximum recursion depth exceeded" errors 
on creation of a Dexterity-based content type.

vanilla developing buildout pinned at latest release:

https://github.com/plonegovbr/brasil.gov.agenda/blob/master/travis.cfg

sample output:

https://travis-ci.org/plonegovbr/brasil.gov.agenda/builds/40090559

any hints?
-- 
Héctor Velarde

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