Type Alias ClassificationOp

ClassificationOp:
    | "eq"
    | "ne"
    | "contains"
    | "notContains"
    | "matches"
    | "notMatches"
    | "isSet"
    | "isNotSet"

Classification value+presence ops. A classification is matched against its code / name string, so this is the StringOp comparison subset plus presence — numeric ops don't apply.