Improvements 🔧

• Impl str_increment / str_decrement return type extension (#2776), thanks @zonuexe!

Bugfixes 🐛

• Fix loading polyfills twice (https://github.com/phpstan/phpstan/commit/3e7c7c7c6306157e6967ef436e952aeba1097edb?w=1), #10387
• array_udiff() comparator return type is too strict (#2822), #9697, thanks @staabm!

Internals 🔍

• Simplify default return path in extensions (#2816), thanks @staabm!