Fix context.setValue to make the raw value return the latest.
Fix context.setValue to make the raw value return the latest.

Fixes this code snippet:

X.sub({ a$: SimpleValue.create(1) });
X.a -> 1
X.a$.set(2);
X.a -> 2

foam-framework/foam,foam-framework/foam,jlhughes/foam,jlhughes/foam,foam-framework/foam,foam-framework/foam,jlhughes/foam,jlhughes/foam,foam-framework/foam