This is a bugfixing release.
Module developers, if your module provides layers or behaviors, there are a lot of chance that you'll have to update.
As example, see the patch for the Geofield module.
Here's a guide, it's really easy.
Enhancements & bug fix
Remove unused maxExtent of sample layer - Augustus Kling, 32 minutes ago
Drop maxExtent from layers where layers don't handle it. - Augustus Kling, 42 minutes ago
Use maxExtent of WMTS layers only if set - Augustus Kling, 43 minutes ago
Do not modify parameter when there is no need to do so - Augustus Kling, 56 minutes ago
Add a test on map, to check if maxExtent is an array before using it. - Pol Dell'Aiera, 2 hours ago
Issue #1960870: Layer Types JS Cleanup: Layer Types JS Cleanup. - Pol Dell'Aiera, 2 hours ago
Updating examples. - Pol Dell'Aiera, 2 hours ago
Fix CSS to get it working with some responsive themes. - Pol Dell'Aiera, 3 hours ago
Pass isBaseLayer option to WMTS layers so that is it not assumed they would all be base layers - Augustus Kling, 13 hours ago
Stricter checking of layers' maxExtent to avoid setting invalid values - Augustus Kling, 14 hours ago
Adding a TODO for a future cleaning. - Pol Dell'Aiera, 15 hours ago