"c1": integerType,
					}),
					"d2": objectType(map[string]schema.Structural{
						"e2": integerType,
					}),
				}),
			}),
			// https://github.com/google/cel-spec/blob/master/doc/langdef.md#field-selection
			valid: []string{
				"has(self.a.b)",
				"!has(self.a.c)",
				"!has(self.a.d)", // We treat null value fields the same as absent fields in CEL
				"has(self.a1.b1.c1)",