Prototypes are useful; they're just not useful for checking the number and type of arguments to a function.

use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name
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In reply to Re^3: passing array of args to prototyped subs by tobyink
in thread passing array of args to prototyped subs by pldanutz

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