Currently it can be:

- nil
- bool
- integer

In python this isn't really a problem due to '__bool__', but in Golang
we don't have this. Yes - it would be possible to make a parser in
Golang to decode all of these values as either True/False, but this is
much more complex than just adjusting python to send consistent data
types. It's also easier to describe a protocol where one parameter is
always 'bool' instead of having a parameter that is 'bool | int | NoneType'.