Change record status: 
Project: 
Introduced in branch: 
8.5.x
Introduced in version: 
8.5.0-alpha1
Description: 

In previous versions of Drupal 8, base fields with existing data stored in the shared entity tables could not be uninstalled, which in turn meant that modules providing base fields to other entity types were also not able to be uninstalled.

Starting with Drupal 8.5.0, all base fields can be safely uninstalled. Their existing data will be moved from the shared tables to a dedicated one and it will be gradually purged on cron.

Impacts: 
Site builders, administrators, editors
Module developers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done