Implemented float literals for OwnedLiterals, not yet for serde_json.

js/test_cases/helpers_eq/main.dust

@@ -27,3 +27,7 @@ Do objects with different paths referencing the same variable match?{~n}
 {#int renamed=some_obj}
     {@eq key=some_obj value=renamed}some_obj equals renamed{:else}some_obj does not equal renamed{/eq}{~n}
 {/int}
+
+Floating point equality{~n}
+======================={~n}
+{@eq key=int value=7.0}int is equal to 7.0{:else}int is not equal to 7.0{/eq}