[twconfig] Set default value for "interface" to 0.0.0.0
This value means "all IP addresses on this host", which seems to fit with
"default to everywhere" that's documented.
Closes #15135610.
.. _appobject_module:
:mod:`cubicweb.appobject`
=========================
.. automodule:: cubicweb.appobject
.. autoclass:: AppObject
:show-inheritance:
:members: