Use guest identity instead of nulls

[xepozz]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	✔️

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.09 ⚠️

Comparison is base (427a5ab) 88.44% compared to head (47713d9) 88.36%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #73      +/-   ##
============================================
- Coverage     88.44%   88.36%   -0.09%     
+ Complexity       95       93       -2     
============================================
  Files            13       13              
  Lines           277      275       -2     
============================================
- Hits            245      243       -2     
  Misses           32       32              

Impacted Files	Coverage Δ
src/CurrentUser.php	100.00% <100.00%> (ø)
src/UserAuth.php	100.00% <100.00%> (ø)

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[samdark]

Overall the change looks OK. Need a CHANGELOG for it.

Also, it's is backwards compatibility breaking one.

[vjik]

It's break logic of Yii Auth package in Authentication middleware: https://github.com/yiisoft/auth/blob/27a4e9ac4e89d810625c73f1578586d2ecdc9c27/src/Middleware/Authentication.php#L48C43-L48C53

[xepozz]

It shouldn't be merged yet because it cause bugs in authentication.