Is it enough to just write something like

@sum_type Fruit begin
    apple
    banana
    orange
    kiwi
    pear
    mango
end

is_apple(f::Fruit) = @cases f begin
    apple => true
    [banana, orange, kiwi, pear, mango] => false 
end

?

The list of possible variants is much too long for the situation I am dealing with. Admittedly, maybe that is code smell and I should use a different approach. Independently of that though, is that a feature that makes sense to be added?

Should now work with #56! Will be released as version 0.5.1 and available on the General registry once this finishes: JuliaRegistries/General#95659

Wow, that was amazingly quick! Thank you, it is much appreciated!

Happy to help!