optional type hinting in guessExtension
optional type hinting in guessExtension

Null is allowed as the return value of \Config\Mimes::guessExtensionFromType that's why should be allowed in guessExtension either.
thx @daljit3  for pointig this out.
butane/CodeIgniter4,butane/CodeIgniter4,lonnieezell/CodeIgniter4,gustavojm/CodeIgniter4,samsonasik/CodeIgniter4,jim-parry/CodeIgniter4,ytetsuro/CodeIgniter4,lonnieezell/CodeIgniter4,jim-parry/CodeIgniter4,natanfelles/CodeIgniter4,bcit-ci/CodeIgniter4,gustavojm/CodeIgniter4,ytetsuro/CodeIgniter4,ytetsuro/CodeIgniter4,lonnieezell/CodeIgniter4,samsonasik/CodeIgniter4,bcit-ci/CodeIgniter4,kenjis/CodeIgniter4,bcit-ci/CodeIgniter4,gustavojm/CodeIgniter4,bcit-ci/CodeIgniter4,samsonasik/CodeIgniter4,butane/CodeIgniter4,natanfelles/CodeIgniter4,jim-parry/CodeIgniter4,natanfelles/CodeIgniter4,samsonasik/CodeIgniter4,ytetsuro/CodeIgniter4,jim-parry/CodeIgniter4,lonnieezell/CodeIgniter4,samsonasik/CodeIgniter4,kenjis/CodeIgniter4,samsonasik/CodeIgniter4,jim-parry/CodeIgniter4,bcit-ci/CodeIgniter4,natanfelles/CodeIgniter4,lonnieezell/CodeIgniter4,kenjis/CodeIgniter4,natanfelles/CodeIgniter4,kenjis/CodeIgniter4,natanfelles/CodeIgniter4,gustavojm/CodeIgniter4,ytetsuro/CodeIgniter4,kenjis/CodeIgniter4,ytetsuro/CodeIgniter4,butane/CodeIgniter4,jim-parry/CodeIgniter4,butane/CodeIgniter4,butane/CodeIgniter4,lonnieezell/CodeIgniter4