Filter result fix

[RottenRat]

Overview

This refactors (*Wrapped).UnmarshalTo to relax the type-matching rule and fix panic cases:

• Replaces the strict rw.Type() == rv.Type() comparison with rw.Type().AssignableTo(rv.Elem().Type()).
• Adds defensive handling of *T(nil) → value T (writes zero-value instead of propagating nil).
• Supports one-level pointer unwrapping when Wrapped is a **T and the target is *T.
• Extends the test-suite with new cases

Overall, the helper becomes a more intuitive drop-in for typical hook scenarios (templating, caching, deserialising to interfaces).

What this PR does / why we need it

We need to cover stable code with no panic

Special notes for your reviewer

The key design question: Do we want the relaxed AssignableTo contract, or should we keep the old, stricter equality check?