Review copy out
Currenty _pq_copy_out_v3 is using PyObject_CallFunction(func, "s#", buffer, len) to pass data read from the db to the file: this implies utf8 encoding, so would break on different client encodings.
Shall we pass unicode or bytes? Shall we check if the file has an encoding?
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Psycopg is the most used PostgreSQL adapter for the Python programming language. At the core it fully implements the Python DB API 2.0 specifications. Several extensions allow access to many of the features offered by PostgreSQL.