Rename setters.DISABLE to setters.NO_OP to clarify its purpose

DISABLE sounds less purposeful and doesn't convey its meaning as well.

docs/api.rst

@@ -531,7 +531,7 @@ These are helpers that you can use together with `attr.s`'s and `attr.ib`'s ``on
 .. autofunction:: attr.setters.validate
 .. autofunction:: attr.setters.convert
 .. autofunction:: attr.setters.pipe
-.. autodata:: attr.setters.DISABLE
+.. autodata:: attr.setters.NO_OP
 
    For example, only ``x`` is frozen here:
 
@@ -540,7 +540,7 @@ These are helpers that you can use together with `attr.s`'s and `attr.ib`'s ``on
      >>> @attr.s(on_setattr=attr.setters.frozen)
      ... class C(object):
      ...     x = attr.ib()
-     ...     y = attr.ib(on_setattr=attr.setters.DISABLE)
+     ...     y = attr.ib(on_setattr=attr.setters.NO_OP)
      >>> c = C(1, 2)
      >>> c.y = 3
      >>> c.y

src/attr/_make.py

@@ -203,10 +203,10 @@ def attrib(
         parameter is ignored).
     :param on_setattr: Allows to overwrite the *on_setattr* setting from
         `attr.s`. If left `None`, the *on_setattr* value from `attr.s` is used.
-        Set to `attr.setters.DISABLE` to run **no** `setattr` hooks for this
+        Set to `attr.setters.NO_OP` to run **no** `setattr` hooks for this
         attribute -- regardless of the setting in `attr.s`.
     :type on_setattr: `callable`, or a list of callables, or `None`, or
-        `attr.setters.DISABLE`
+        `attr.setters.NO_OP`
 
     .. versionadded:: 15.2.0 *convert*
     .. versionadded:: 16.3.0 *metadata*
@@ -797,7 +797,7 @@ def add_init(self):
                 self._base_attr_map,
                 self._is_exc,
                 self._on_setattr is not None
-                and self._on_setattr is not setters.DISABLE,
+                and self._on_setattr is not setters.NO_OP,
             )
         )
 
@@ -830,7 +830,7 @@ def add_setattr(self):
         sa_attrs = {}
         for a in self._attrs:
             on_setattr = a.on_setattr or self._on_setattr
-            if on_setattr and on_setattr is not setters.DISABLE:
+            if on_setattr and on_setattr is not setters.NO_OP:
                 sa_attrs[a.name] = a, on_setattr
 
         if not sa_attrs:
@@ -1765,7 +1765,7 @@ def _make_init(
 
             needs_cached_setattr = True
         elif (
-            has_global_on_setattr and a.on_setattr is not setters.DISABLE
+            has_global_on_setattr and a.on_setattr is not setters.NO_OP
         ) or _is_slot_attr(a.name, base_attr_map):
             needs_cached_setattr = True
 
@@ -1932,7 +1932,7 @@ def fmt_setter_with_converter(
 
         attr_name = a.name
         has_on_setattr = a.on_setattr is not None or (
-            a.on_setattr is not setters.DISABLE and has_global_on_setattr
+            a.on_setattr is not setters.NO_OP and has_global_on_setattr
         )
         arg_name = a.name.lstrip("_")
 

src/attr/setters.py

@@ -67,7 +67,7 @@ def convert(instance, attrib, new_value):
     return new_value
 
 
-DISABLE = object()
+NO_OP = object()
 """
 Sentinel for disabling class-wide *on_setattr* hooks for certain attributes.
 

src/attr/setters.pyi

@@ -10,5 +10,5 @@ def pipe(*setters: _OnSetAttrType) -> _OnSetAttrType: ...
 def validate(instance: Any, attribute: Attribute, new_value: _T) -> _T: ...
 def convert(instance: Any, attribute: Attribute, new_value: _T) -> _T: ...
 
-_DisableType = NewType("_DisableType", object)
-DISABLE: _DisableType
+_NoOpType = NewType("_NoOpType", object)
+NO_OP: _NoOpType

tests/typing_example.py

@@ -189,7 +189,7 @@ class OrderFlags:
 @attr.s(on_setattr=attr.setters.validate)
 class ValidatedSetter:
     a = attr.ib()
-    b = attr.ib(on_setattr=attr.setters.DISABLE)
+    b = attr.ib(on_setattr=attr.setters.NO_OP)
     c = attr.ib(on_setattr=attr.setters.frozen)
     d = attr.ib(on_setattr=[attr.setters.convert, attr.setters.validate])
     d = attr.ib(