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  1. or download this
    use Types::Standard is_InstanceOf => { of => "FishTaco::Topping", -as 
+=> "is_Topping" };

is_Topping( $something );  # returns a boolean
  2. or download this
    BEGIN {
  require Types::Standard;
  *is_Topping = Types::Standard::InstanceOf->parameterize("FishTaco::T
+opping")->compiled_check;
};