Wren doesn't have "operator overloading". There is no separate feature in addition to the normal operator support that also lets you overload them. Wren just uses single dispatch for infix operators. Even the "built in" operator behavior like addition on numbers is simply pre-defined methods on the Number class. Like Smalltalk (which Wren is heavily inspired by), everything is just a method call and there is little "special" behavior for primitives.