Improve support for arrays of composite types #33
Description
It's unclear at the moment how to pass composite type values (in my case, arrays of them) to asyncpg.
For example, if I want to do something like this:
CREATE TYPE keyvalue AS (key text, value text);
CREATE TABLE test (id int, data keyvalue);
INSERT INTO test (id, data) VALUES (1, ROW('stuff', 'things'));How to do so with asyncpg isn't clear. I've tried tuples and received errors about integer types (one part of my composite type is an integer). The docs mention something about a Record type but not where to find it.