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- Add support for transaction managers operating in explicit mode.
Schema managers were previously required not to commit transactions
in their ``evolve`` or ``install`` methods, but a loophole was open
to allow them to commit "if there were no subsequent operations".
That loophole is now closed, at least in explicit mode. See `issue 8
<https://github.com/zopefoundation/zope.generations/issues/8>`_.