Feature request

This file https://github.com/mmarton/phpstan-issue8146/blob/master/src/DataFixtures/LocationFixtures.php from #8146 really slows PHPStan down, because it contains a lot of literal arrays.

The performance was better before: phpstan/phpstan-src#1741

This PR phpstan/phpstan-src#1830 looked promising, it improved the performance on 1.8.x, but after rebasing on 1.9.x, it's slow again.

This PR phpstan/phpstan-src#2077 (basically a revert of phpstan/phpstan-src#1741) helps to solve this problem by dumbing down huge constant arrays (making types less precise) at the cost of new false positives because of the lost precision.