What options are there for fixtures to export?

Can someone please provide a list of the valid options for fixtures? I have so far found “Custom Script”, “Custom Field”, “Property Setter”, and “Doctype” work without error, with varying degrees of success in what was exported.

Ideally I need to be able to export changes to default doctypes, e.g. changing a field to mandatory or adding it to listview.

Rather than look over the code this is dated but may help with clues?
Fixtures Support - filters - #2 by rmehta