This is what functionality looks like when supplying incorrect attribute names with the patch.

Python 3.11.0a6+ (heads/bpo-47135-dirty:d4bb38f82b, Apr  1 2022, 20:01:56) [GCC 11.1.0] on linux
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>>> import _pydecimal
>>> ctx = _pydecimal.getcontext()
>>> ctx.precision = 10
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/run/media/sam/OS/Git/cpython/Lib/_pydecimal.py", line 3974, in __setattr__
    raise AttributeError(
    ^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'decimal.Context' object has no attribute 'precision'
>>> with _pydecimal.localcontext(precision=10) as ctx:
...     pass
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/run/media/sam/OS/Git/cpython/Lib/_pydecimal.py", line 506, in localcontext
    setattr(ctx, key, value)
    ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/run/media/sam/OS/Git/cpython/Lib/_pydecimal.py", line 3974, in __setattr__
    raise AttributeError(
    ^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'decimal.Context' object has no attribute 'precision'
>>> import decimal
>>> ctx = decimal.getcontext()
>>> ctx.precision = 10
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'decimal.Context' object has no attribute 'precision'
>>> with decimal.localcontext(precision=10) as ctx:
...     pass
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'precision' is an invalid keyword argument for this function
>>>