Most notably:
* Use the much more narrow UserIdentity interface where possible.
* Make array type hints in PHPDocs as specific as possible.
Change-Id: Id189da4028b7874909277881dcf6539169dd13b6
We are getting rid of the schema of implementing this interface and
calling self::READ_* constants, it's confusing, inconsistent, prone to
clashes and isn't really useful for non-ORM systems (which we are not)
Bug: T354194
Change-Id: Ic05e9fa663ddb97fcc8290f2629d3ad89b6791a5
Changes to the use statements done automatically via script
Addition of missing use statements done manually
Change-Id: Iad87245bf8082193be72f7e482f29e9f1bad11fc
Most notably, CatchableFatalErrorException and the code that throws it
are unused since Ic5712c4ce265b6faabce7a4028b4294fe3c73f18 (in 2016).
Bug: T328220
Change-Id: I5497347e41b21d2623b7e79bf7f977268a809c1d
