glibmm-2.56 or glibmm-2.58 ABI?

[Kjell Ahlstedt <kjellahlstedt gmail com>]

Now glib 2.56.0 has been released.

Will glibmm 2.56.0 be released with glibmm-2.4 ABI, and will the next parallel-installable ABI be glibmm-2.58?
If so, we should take the chance to add some new API before glibmm 2.56.0 is released. E.g. as suggested in
https://bugzilla.gnome.org/show_bug.cgi?id=787496
https://bugzilla.gnome.org/show_bug.cgi?id=495762#24

Kjell