json_populate_* functions have extra undocumented parameter

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Page: https://www.postgresql.org/docs/10/static/functions-json.html
Description:

The json_populate_record and json_populate_recordset functions have an extra
optional undocumented boolean parameter. According to
https://w3resource.com/PostgreSQL/postgresql-json-functions-and-operators.php
the extra parameter is called "use_json_as_text".