Fix pydoc getting confused by our __file__ if __doc__ is not defined (should be fixed with 1865 as well, only happens if __doc__ does not exist for some type)
Maybe ensure that the path of the runtimeconfig.json is automatically added to sys.path? Decided against this, as runtime_config is now an optional parameter.
Maybe default to .NET Core if Mono is not available on Unix? Decided against this, it would be a much worse experience if the default changed just because someone installed Mono.