While preparing Debian packaging for MariaDB Connector/C version 2.2.2, I noticed that there's an ABI breakage without a corresponding change of SONAME: version 2.0.0 had a symbol "get_tty_password@Base" whereas version 2.2.2 doesn't.  I'm wondering how big of a breakage it is - i.e. is that something that was never meant to be in the API/ABI in the first place, or is an oversight?