Please release a gtk-doc suitable for GNOME 3.38
GLib currently (since 60dd272b) has a dependency on a version of gtk-doc that has not yet been released, which is problematic for OS distributions that are trying to package GNOME 3.38 beta releases early enough that we can give useful feedback.
For now, I'm looking at packaging a snapshot of git master in Debian, but that isn't ideal for an OS release that is meant to be supported for multiple years; it would be better if we could package a release, preferably with !55 (merged) included so that we can build from an official tarball release using either Autotools or Meson.
Whether that release includes support for GTK 4 actions (#121 (closed), !30 (closed)) is up to you. I'm currently looking into bundling (vendoring) a copy of the !30 (closed) branch in our GTK 4 packaging, so that we aren't forced to use an unmerged branch of gtk-doc to build documentation for the rest of GNOME.