# Uses string compare to determine uniqueness.
tie %hash, 'Tie::Hash::MultiValue', 'unique';

# Uses numerical compare to determine uniqueness.
tie %hash, 'Tie::Hash::MultiValue', unique => sub { $_[0] == $_[1] };

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In reply to Re^7: Tie::Hash::MultiValue Unique question by ikegami
in thread Tie::Hash::MultiValue Unique question by elsubliminal

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