Sure it is. You advertised that you accept array references it shouldn't matter to you what someone else thinks of that array. If someone else has an object and they think that its fine for someone else to treat their object as a plain array then it isn't a problem for the isa-using function author to do so.

In reply to Re: Re: Is "ref $date eq 'ARRAY'" wrong? by diotalevi
in thread Is "ref $date eq 'ARRAY'" wrong? by bronto

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