Hello, I am a newbie, and encountered this problem, which I suspect is due to my unfamiliar with the syntax but cannot see how to fix.

When I declare {x,y} as coordinates, \partial{#} as partial derivative w.r.t. all coordinates, f to depend only on x and g on y; I am expecting the unwrap function to move the derivative w.r.t. x pass g and the derivative w.r.t. y pass f, but this does not happen. My code:

```
{x,y}::Coordinate.
\partial{#}::PartialDerivative.
f::Depends(\partial{x}).
g::Depends(\partial{y}).
ex:=\partial_{x}{A*f*g};
unwrap(_);
ex:=\partial_{y}{A*f*g};
unwrap(_);
```

In both cases I am getting A*\partial_{x}{f*g} and A*\partial_{y}{f*g}, but expecting Ag*\partial_{x}{f}

EDIT: formation