Improvements 🔧

• Implemented constant type inference for implode() function (#991), thanks @staabm!

Bugfixes 🐛

• Fix interaction between template type and union type (#992), #5591, thanks @arnaud-lb!
• Delegate most of TypeCombinator::remove() to Type::tryRemove() (#994), #6438, thanks @arnaud-lb!
• TemplateType should accept a TemplateType derived from itself (#999), #5844, #5706, thanks @arnaud-lb!
• Fixed intersecting and removal from TemplateUnionType (phpstan/phpstan-src@0d28835), #6566
• Fixed type seen by IterableInForeachRule with inline @var right above foreach (phpstan/phpstan-src@b6bbbaf), #6564
• modulo 1 is always zero (#973), thanks @staabm!
• multiply by zero is always zero (#974), thanks @staabm!
• Fixed discovering backed enum without space around : (phpstan/phpstan-src@5162bcf), composer/composer#10498

Function signature fixes 🤖

• Function md5() always return non-empty-string (#987), thanks @janbarasek!
• Correct the case for parameters that accept an instance of Iterator. (#988), thanks @johnbillion!
• Fix the return types of round()/ceil()/floor() (#729), thanks @johnbillion!
• Correct the return type of SplFileObject::fstat() (#996), thanks @johnbillion!
• Improve the return type of functions that return an indexed array of strings (#997), thanks @johnbillion!