4.4.0 (Unreleased)

Overview

Correct PHP types are now returned from database queries
Server Requirements have been refined: MySQL 5.5 end of life reached in December 2018, thus SilverStripe 4.4 requires MySQL 5.6+.
SilverStripe 4.3 and prior still support MySQL 5.5 for their own lifetime.
The name of the directory where vendor module resources are exposed can now be configured by defining a extra.resources-dir key in your composer.json file. If the key is not set, it will automatically default to resources. New projects will be preset to _resources. This will avoid potential conflict with SiteTree URL Segments.
dev/build is now non-destructive for all Enums, not just ClassNames. This means your data won't be lost if you're switching between versions, but watch out for code that breaks when it sees an unrecognised value!

Update your .gitignore file to ignore the new _resources directory. This file is typically located in the root of your project or in the public folder.
Add a new extra.resources-dir key to your composer file.

{
    // ...
    "extra": {
        // ...
        "resources-dir": "_resources"
    }
}

Expose your vendor assets by running composer vendor-expose.
Remove the old resources folder. This folder will be located in the public folder if you have adopted the public web root, or in the root of your project if you haven't.

You may also need to update your server configuration if you have applied special conditions to the resources path.

PDOQuery::__construct() now has a 2nd argument. If you have subclassed PDOQuery and overridden __construct() you may see an E_STRICT error
The name of the directory where vendor module resources are exposed can now be configured by adding a extra.resources-dir key to your composer file. The new default in silverstripe/installer has been changed to _resources rather than resources. This allows you to use resources as a URL segment or a route.