kubernetes/vendor/github.com/google/cel-go/common/types/util.go

// IsUnknownOrError returns whether the input element ref.Val is an ErrType or UnknownType.
func IsUnknownOrError(val ref.Val) bool { … }

// IsPrimitiveType returns whether the input element ref.Val is a primitive type.
// Note, primitive types do not include well-known types such as Duration and Timestamp.
func IsPrimitiveType(val ref.Val) bool { … }

// Equal returns whether the two ref.Value are heterogeneously equivalent.
func Equal(lhs ref.Val, rhs ref.Val) ref.Val { … }