The theme mod functions now store their …

The theme mod functions now store their values differently. This has the potential to break plugins that were directly querying these options instead of utilizing the APIAPI An API or Application Programming Interface is a software intermediary that allows programs to interact with each other and share data in limited, clearly defined ways..

If you are using the API, i.e. get_theme_mod(), set_theme_mod(), remove_theme_mod(), remove_theme_mods(), then you’re fine.

Reference: https://core.trac.wordpress.org/changeset/15736.

#3-1, #dev-notes