interface h2_error const new: (self, { "name": string?, "code": integer?, "description": string?, "message": string?, "traceback": string?, "stream_error": boolean? }) -> (h2_error) const new_traceback: (self, string, boolean, integer?) -> (h2_error) const error: (self, string, boolean, integer?) -> (void) end errors: {any:h2_error} is: (any) -> (boolean)