I've done this on two rare occasions: round-tripping 'null' in JSON and 'NULL' in database queries. My solution, which was perhaps overly cute, was a table can

I've done this on two rare occasions: round-tripping 'null' in JSON and 'NULL' in database queries. My solution, which was perhaps overly cute, was a table canonically named No, which is callable such that No(nil), No(false), and No(No) all return true. So I could say if No(value) then When I needed to do conditional logic which excludes those reified null values, which isn't often.