(Note: It looks like the Trello board is for the main DevDocs at devdocs.io, so I disregarded the instructions in the issue template. Let me know if this was an incorrect assumption.)
I'm looking for information on the JavaScriptCore API; specifically, how to unmarshal values returned by the WebKit2.UserContentManager.script-message-received signal. It seems that it's been implemented, but not yet pushed to DevDocs.
See https://gitlab.gnome.org/GNOME/gjs/issues/283 and the attached merge request for a list of functions to skip. More generally, functions that require passing in an input buffer which gets modified by the function, need to be skipped.