"no codec for array element type" with enum arrays

[rijenkii]

• asyncpg version: 0.9.0
• PostgreSQL version: 9.6.1
• Python version: 3.6.1
• Platform: Linux x86_64
• Do you use pgbouncer?: No
• Did you install asyncpg with pip?: Yes
• If you built asyncpg locally, which version of Cython did you use?:
• Can the issue be reproduced under both asyncio and
  uvloop?: Yes

This issue is similar to #82 , but now with enums

Steps:

1. CREATE TYPE custom_type AS ENUM ('a', 'b');

import asyncio
import asyncpg

async def main():
    conn = await asyncpg.connect(database='test')
    print(await conn.fetch('SELECT $1::custom_type[]', ('a', 'b')))
    await conn.close()

asyncio.get_event_loop().run_until_complete(main())

  File "bug_test.py", line 9, in <module>
    asyncio.get_event_loop().run_until_complete(main())
  File "/usr/lib/python3.6/asyncio/base_events.py", line 466, in run_until_complete
    return future.result()
  File "bug_test.py", line 6, in main
    print(await conn.fetch('SELECT $1::test[]', ('a', 'b')))
  File "/usr/lib/python3.6/site-packages/asyncpg/connection.py", line 269, in fetch
    stmt = await self._get_statement(query, timeout)
  File "/usr/lib/python3.6/site-packages/asyncpg/connection.py", line 221, in _get_statement
    protocol.get_settings().register_data_types(types)
  File "asyncpg/protocol/settings.pyx", line 32, in asyncpg.protocol.protocol.ConnectionSettings.register_data_types (asyncpg/protocol/protocol.c:4675)
  File "asyncpg/protocol/settings.pyx", line 33, in asyncpg.protocol.protocol.ConnectionSettings.register_data_types (asyncpg/protocol/protocol.c:4598)
  File "asyncpg/protocol/codecs/base.pyx", line 373, in asyncpg.protocol.protocol.DataCodecConfig.add_types (asyncpg/protocol/protocol.c:16334)
RuntimeError: no codec for array element type 25923

[elprans]

This is the same issue as in #82, and has been fixed in master.

[1st1]

We'll release a new version this week with a fix.