Update QuatDescriptor for typed-descriptor-lazy-default

Quaternion/Quaternion.py

@@ -1093,10 +1093,12 @@ class QuatDescriptor(TypedDescriptor):
     ----------
     default : QuatLike, optional
         Default value for the attribute.  If not specified, the default for the
-        attribute is ``None``.
+        attribute is ``None``. If the intent is to default to a particular attitude,
+        this must be a tuple such as ``(0, 0, 0, 1)`` or ``(0, 0, 0)`` or a ``Quat``
+        object. A list is not allowed.
     required : bool, optional
-        If ``True``, the attribute is required to be set explicitly when the object
-        is created. If ``False`` the default value is used if the attribute is not set.
+        If ``True``, the attribute is required to be set explicitly when the object is
+        created. If ``False`` the default value is used if the attribute is not set.
 
     Examples
     --------
@@ -1105,7 +1107,7 @@ class QuatDescriptor(TypedDescriptor):
     >>> @dataclass
     ... class MyClass:
     ...     att1: Quat = QuatDescriptor(required=True)
-    ...     att2: Quat = QuatDescriptor(default=[10, 20, 30])
+    ...     att2: Quat = QuatDescriptor(default=(10, 20, 30))
     ...     att3: Quat | None = QuatDescriptor()
     ...
     >>> obj = MyClass(att1=[0, 0, 0, 1])

Quaternion/tests/test_all.py

@@ -744,15 +744,15 @@ class MyClass:
     assert np.allclose(obj.quat.equatorial, [10, 20, 30], rtol=0, atol=1e-10)
 
     with pytest.raises(
-        ValueError, match="cannot set required attribute 'quat' to None"
+        ValueError, match="attribute 'quat' is required and cannot be set to None"
     ):
         MyClass()
 
 
 def test_quat_descriptor_has_default():
     @dataclass
     class MyClass:
-        quat: Quat = QuatDescriptor(default=[10, 20, 30])
+        quat: Quat = QuatDescriptor(default=(10, 20, 30))
 
     obj = MyClass()
     assert np.allclose(obj.quat.equatorial, [10, 20, 30], rtol=0, atol=1e-10)