qol: impl Operable on references of Operable types as well

src/lib.rs

@@ -215,6 +215,8 @@ pub enum Method {
 // them directly
 mod seal {
     pub trait Sealed {}
+    impl<T: Sealed> Sealed for &T {}
+    impl<T: Sealed> Sealed for &mut T {}
 }
 
 /// Signifies that a query has been validated through some of the validation methods

src/query/ops/mod.rs

@@ -31,3 +31,6 @@ pub use logic::Logical;
 
 /// Marker trait for signifying that a type can be used with the operators
 pub trait Operable: Display + Sealed {}
+
+impl<T: Operable> Operable for &T {}
+impl<T: Operable> Operable for &mut T {}