coleifer/peewee 4.1.0

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• Unfortunately, the new JSONField did not play nice w/MySQL when query was
  generated before a conn was opened. We were trying to do some introspection
  on the server version, but I've decided instead to make mariadb= be a
  database param, per @alisonatwork's suggestion, with the default being
  "MySQL" flavored JSON. Refs #3053
• JSONField containment (contains, contained_by) no longer wraps its
  argument in CAST / JSON_COMPACT on MySQL/MariaDB, #3053.

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