Bug report

I checked the open/closed issues first and there were some performance issues in v1.8.3 reported for huge array types. The related issues are closed as fixed in v1.8.4, but the problem remains. I couldn't find any other related issue, so opening this one.

In atk4/ui the phpstan CI time has increased 3x - 4x since phpstan v1.8.2:

• phpstan v1.8.2 - 14s - https://github.com/atk4/ui/runs/8137105524?check_suite_focus=true#step:10:1
• phpstan v1.8.3 - 38s - https://github.com/atk4/ui/runs/8139810834?check_suite_focus=true#step:10:1
• phpstan v1.8.4 - 44s - https://github.com/atk4/ui/runs/8169956545?check_suite_focus=true#step:10:1

Code snippet that reproduces the problem

n/a, performance issue

Expected output

phpstan should complete in < 15s