Problem/Motivation
The two DefaultTableMapping::setFieldNames() and ::setExtraColumns() methods are internal helpers of the table mapping class and should not be exposed as public API.
Proposed resolution
Change them to be protected instead.
Remaining tasks
Wait until the 9.0.x branch is opened, write a patch, etc.
User interface changes
Nope.
API changes
Nope.
Data model changes
Nope.
Release notes snippet
Nope.