Determine what to do with the BC layer for doctrine/common 2.2 at ExtensionMetadataFactory::getDriver()

[phansys]

We need to confirm what is the purpose for the BC layer provided at ExtensionMetadataFactory::getDriver(), as it is not clear if this is intended to provide compatibility for doctrine/common >= 2.2.0 or doctrine/common < 2.2.0.

DoctrineExtensions/src/Mapping/ExtensionMetadataFactory.php

Line 206 in 7493440

// BC for Doctrine 2.2

It seems confusing to me, as the commit where the change was introduced is also updating the constraint to "doctrine/common": ">=2.2,<2.4-dev". See 9e58bb7.

[stof]

Actually, this comment was already there before that commit. See the deleted lines (it appears as added and deleted because its indentation has changed)

[stof]

the comment was added in 01ca830

In doctrine/common 2.3+, the driver is an instance of MappingDriver

[github-actions]

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