asyncpg does not work with "sslmode" query param when called from SQLAlchemy

• asyncpg version: 0.22
• PostgreSQL version: 12.3
• Do you use a PostgreSQL SaaS? If so, which? Can you reproduce
  the issue with a local PostgreSQL install?: I use DigitalOcean and was able to also reproduce it locally
• Python version: 3.8.9
• Platform: Linux
• 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?: N/D

First, congratulation to the people of MagicStack for this great library.

When using DigitalOcean default environment DATABASE URL to set the database string on my app I got the following error:

  File "/usr/local/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 599, in __connect
    connection = pool._invoke_creator(self)
  File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/create.py", line 578, in connect
    return dialect.connect(*cargs, **cparams)
  File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/default.py", line 558, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "/usr/local/lib/python3.8/site-packages/sqlalchemy/dialects/postgresql/asyncpg.py", line 747, in connect
    await_only(self.asyncpg.connect(*arg, **kw)),
TypeError: connect() got an unexpected keyword argument 'sslmode'

In my app, since I use psycopg2 to do some "management tasks", I also need to do something like that:

if ssl_enabled and driver == "asyncpg":
    base_url += "?ssl=require"
elif ssl_enabled and driver == "psycopg2":
    base_url += "?sslmode=require"

Shouldn't asyncpg use the more standard sslmode= query param instead of the ssl=?

Bắt đầu với đường dẫn dialect asyncpg PostgreSQL của SQLAlchemy được hiển thị trong traceback, đặc biệt là sqlalchemy/dialects/postgresql/asyncpg.py, và theo dõi cách các tham số truy vấn của URL đi đến asyncpg.connect. Tái hiện lỗi với sslmode=require và so sánh với ssl=require. Được xem là hoàn tất khi tham số dự định hoạt động thông qua SQLAlchemy mà không có lỗi từ khóa không mong muốn, với coverage cho trường hợp URL kết nối.