WRONG type with prepared statement

[BaiShaoqi]

Expected behavior

INFO:  {'val': False}
CONTEXT:  PL/Python function "test_prep_bool_output"
 test_prep_bool_output
-----------------------
 f
(1 row)

Actual behavior

INFO:  {'val': 0}
 test_prep_bool_output
-----------------------
 f
(1 row)

Step to reproduce the behavior

CREATE OR REPLACE FUNCTION test_prep_bool_output() RETURNS bool
AS $$
# container: plc_python_shared
plan = plpy.prepare("SELECT $1 = 1 AS val", ['int'])
rv = plpy.execute(plan, [0], 5)
plpy.info(rv[0])
return rv[0]['val']
$$ language plcontainer;

SELECT test_prep_bool_output();

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[zhangh43]

Lack of process of conversion of Bool in PLContainer yet.
Need to add PLyObject_ToBool() support.