In the latest development releases of Types::Standard, you can do this:
use Types::Standard is_InstanceOf => { of => "FishTaco::Topping", -as
+=> "is_Topping" };
is_Topping( $something ); # returns a boolean
If you've got Type::Tiny::XS installed, this will be an XS function, so pretty darn fast to call. I haven't done a lot of benchmarking on it, but I'd wager a lot faster than a blessed+isa check. If you don't, then it's still not going to be slow.
(Older versions, you can do something like this for the same effect...
BEGIN {
require Types::Standard;
*is_Topping = Types::Standard::InstanceOf->parameterize("FishTaco::T
+opping")->compiled_check;
};
Newer versions just provide support for of in the import method.)
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