@Incubating
public final class NestedCopyWithSupport
extends Object Runtime support for nested-path copyWith. Resolves dotted keys such
as 'address.city' into a flat map of top-level property to its
replacement value, by recursively applying copyWith to the affected
nested nodes. Plain (non-dotted) keys pass through unchanged.
A nested node whose type does not provide copyWith(Map) fails with
a clear, specific error rather than silent or partial behaviour. Identity
is preserved transitively: an unchanged nested node yields its original
reference, so an unchanged graph yields the original root.
Transactional-block form. Runs block against a recording
delegate that captures plain assignments, nested-path navigation, and
prop.modify { old -> ... } updates, then delegates to the
(nested-aware) copyWith(Map). The block is thus pure sugar over
the map form, inheriting its closed-type-domain and identity guarantees.