options := make([]cel.EnvOption, 0, len(formatLibraryDecls))
	for name, overloads := range formatLibraryDecls {
		options = append(options, cel.Function(name, overloads...))
	}
	for name, constantValue := range ConstantFormats {
		prefixedName := "format." + name
		options = append(options, cel.Function(prefixedName, cel.Overload(prefixedName, []*cel.Type{}, apiservercel.FormatType, ZeroArgumentFunctionBinding(func() ref.Val {

			})),
		},
	}

	// Also test format names and comparisons of all constants
	for keyLHS := range library.ConstantFormats {
		cases = append(cases, testcase{
			name:        "lookup and comparison",
			expr:        fmt.Sprintf(`format.named("%s").hasValue()`, keyLHS),
			expectValue: types.True,
		}, testcase{