From the blog I linked. They might have meant the feature was on by default in 2013. I edited that part away. Here is a much better blog by the library author

From the blog I linked. They might have meant the feature was on by default in 2013. I edited that part away. Here is a much better blog by the library author themself: https://medium.com/@cowtowncoder/on-jackson-cves-dont-panic-here-is-what-you-need-to-know-54cd0d6e8062 https://medium.com/@cowtowncoder/on-jackson-cves-dont-panic-...