Unescape PostgreSQL passfile password#3993
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This PR unescapes the password read from a passfile. Includes unittests and a small error handling refactor.
Is this a breaking change?
Yes. Passfile-provided passwords containing backslashes are now different.
Reference
https://github.com/postgres/postgres/blob/807ee417e562c355360e891f415e6e8e6e4c40ed/src/interfaces/libpq/fe-connect.c#L8065-L8072