This task is about fully deprecating signatures that will be made invalid by the following changes:
The patches to implement the "Requirements" described below should NOT be merged until the following tasks are resolved:
Draft; @ppelberg needs to finalize these.
- When someone attempts to save a signature (~~~~) to a page that is made invalid by the changes listed above, said "signature" should be replaced with that wikis' default signature.
- When should this change be made?
For more details, see the "Implementation plan" described in T248632.