explain why re-declaring the value field is necessary

src/python/pants/engine/target.py

@@ -137,6 +137,9 @@ def sanitize_raw_value(cls, raw_value: Optional[int], *, address: Address) -> Op
                     )
                 return value_or_default
     """
+    # NB: @dataclass requires redeclaring all fields in order for them to be considered in its
+    # generated __hash__() implementation.
+    value: _DefaultBase
 
     @final
     def __init__(self, raw_value: Optional[Any], *, address: Address) -> None:
@@ -217,6 +220,9 @@ def rules():
     """
 
     address: Address
+    # NB: @dataclass requires redeclaring all fields in order for them to be considered in its
+    # generated __hash__() implementation.
+    value: _DefaultBase
 
     @final
     def __init__(self, raw_value: Optional[Any], *, address: Address) -> None: