FlaggingInterface mentions "flaggable" in several places but it was not clear to me what that referred to.
I suggest the first lines of the doc blocks for the following functions be replaced with the text given here:
getFlaggable(): Returns the entity that is flagged by this flagging.
getFlaggableType(): Returns the type (for example 'node') of the entity that is flagged by this flagging.
getFlaggableId(): Returns the ID of the entity that is flagged by this flagging.
Once the text is agreed, I am happy to write a patch.
Active
4.0
Documentation
Please do not include other fixes except documentation text. Create a new issue with other phpcs/unserialize fixes. Thanks!