[mhio]

    something = "else";

That is not observable for the primitive JS types that aren't objects and have no methods or properties or getters/setters (string, number, boolean, undefined, symbol, null).

    some.thing = "else";

The `some` can be proxied and observed. Most frameworks are setting up the `some` container/proxy/object so everything can be accessed and observed consistently. Whether the framework exposes the object, a function, or hides it away in a DSL depends on the implementation.