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As of http://drupal.org/node/1194102#comment-6548832
It would be fine to extend it to:
$valid = array('in', 'or', 'and', 'not');
So it can apply for in case of "Is none of" filter kind.
Comments
Comment #1
mikeker CreditAttribution: mikeker commentedIssue queue cleanup... My apologies for taking so long to address this issue! Seems like a perfectly reasonable request...
Updated the title to clarify things.