https://github.com/gergelypolonkai/synadm/blob/dba8132dd74fe4be1129a78e07dd26806a6331d8/synadm/api.py#L536-L561

None is not considered truthy, so using None as "default" would cause the values to never change. This makes for a poorly functional API that is also very poorly defined (the severe lack of docs is included).

Basically, we have a problem that has nothing to do with this PR, but the PR has the same problems.
We can merge this PR without fixing the issue, but we definitely need to fix the issue which is more than just user types (trying to remove admin doesn't work because of a similar issue (False will not pass an implicit if condition)).

The user modify API and command works together poorly, unable to remove admin rights (too lazy to write that word). This is because it's using implicit if conditions, where values of False and None is used as defined values, but is interpreted as non-defined values.

Example: you can give admin, not remove. you can set user type (#90), you can't revert to default user type.

Originally posted by @JacksonChen666 in #90 (comment)