Can we still use callable $get & callable $set?

In v2 I always prefer to do function (callable $get) because it saves me from having to do a Closure import or having that ugly \Closure but in v3 I read from the upgrade guide that there is now Get & Set classes, so can I still use callable $get & callable $set?

https://filamentphp.com/docs/3.x/panels/upgrade-guide#get-and-set-closure-parameters
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