Breaking: #96983 - TableColumnSubType 

See forge#96983

Description 

The class \TYPO3\CMS\Core\Type\Enumeration\TableColumnSubType has been removed. It has no use anymore, since TCA option internal_type is not evaluated. It was set for the Extbase class ColumnMap, but even there it had no direct usage.

Impact 

In the rare case, that the class TableColumnSubType is used in custom code, it will result in a PHP fatal error.

Affected Installations 

All installations that use TableColumnSubType directly in their custom code.

Migration 

There is no migration, since this enumeration has no use.