Basically just a matter of annotated that `TaskHandler` type as gcsafe so the
compiler knows that even though its indirect, its gcsafe.
Reason I removed it was the error messages weren't clear, like you cant
immediatley tell that its a gcsafe issue.
Could add overload maybe 🤔  To provide better message (or clearly state in the
docs about that issue).
Though I am wondering how smart the compiler is, like can it detect that every
handler passed is gcsafe and then infer that?https://media.discordapp.net/attac
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