ompatibilityVersion=1.21
</code></pre></div></div></div><h2 id=when-should-i-use-compatibility-versions>When should I use compatibility versions?</h2><p>Compatibility versions are recommended to be used only when an incompatibility is found, rather than as the default.
Each compatibility version will only persist for a few releases, so eventually you will need to migrate to the new behavior.
Currently, each compatibility version is intended to remain for at least two versions, though this is subject to chan