@value

Decorator for non-control value types to enable sparse _values tracking.

Applies @dataclass (passing dataclass_kwargs) and installs Prop descriptors via _install_props. No base class is required — the decorator wraps __init__ to inject _values and _dirty before the first Prop.__set__ call, and registers the class as a Value subclass for isinstance checks.

Usage::

@value
class TextStyle:
    color: Optional[str] = None
    size: Optional[float] = None


# or with explicit dataclass kwargs:
@value(eq=False)
class TextStyle: ...