f the sequence must be unequal.</p>
<p>The single optional parameter is a filter. The filter is a VMD type which specifies that both sequences to test must be of that VMD type, as well as being equal to each other, for the test to fail, else it succeeds.</p>
<p>returns = 1 upon success or 0 upon failure. Success means that the sequences are unequal or, if the optional parameter is specified, that the sequences are not of the optional VMD type; otherwise 0 is returned if the sequences are equal.</p>
<p>The m