- Fix `TypeInfo.fetch()` using a connection in `!sql_ascii` encoding
(:ticket:`#503`).
- Fix "filedescriptor out of range" using a large number of files open
in Python implementation (:ticket:`#532`).
- Allow JSON dumpers to be registered on `!dict` or any other object, as was
possible in psycopg2 (:ticket:`#541`).
- Fix canceling running queries on process interruption in async connections
(:ticket:`#543`).
- Fix loading ROW values with different types in the same query using the
binary protocol (:ticket:`#545`).
- Fix dumping recursive composite types (:ticket:`#547`).
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