Currently the filter options across a lot of objects/functions (lists, filters, reports, workflows...) offer -Is Any Of -Is None Of -Is Known -Is Unknown I just found out that "Is None Of" and "Is Unknown" work differently. Take 3 different values for a field (last one is left intentionally blank): Score = 0 Score = 1 Score = "Is Known" matches 0 and 1, not blank "Is Unknown" only matches the blank one "Is None Of 1" only matches 0, not blank or 1 "Is Any of 1" only matches 1, not 0 or blank I would expect "Is None of 1" to match blank but that is NOT the case, and should be clearer in the UI. Some may even expect 0 or FALSE to match unknown depending on context. Either a pop-over [i] icon that explains in the UI or renaming "Is None Of" to "Is Known But None Of"
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