Documentation request: where are 'qmark' and other properties documented?

[pjfarleyiii]

In examples/checkbox.py there is a key named 'qmark' that is set to a UTF-8 character (a question mark inside a diamond I think). In the default and custom styles provided with PyInquirer there are other similar properties defined (like 'pointer') for which I cannot seem to find any documentation.

I also looked into prompt_toolkit documentation and did not see such properties or keys defined there.

Is it possible to get some explanations of all such properties or keys, or am I just looking in the wrong place(s)?

Or at least a source code location that one could browse to get some definition?

Peter