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��r- c s" t � �dtdtf� fdd� �}|S )a� A decorator that makes given function validator.
Whenever the given `func` returns `False` this
decorator returns `ValidationError` object.
Examples:
>>> @validator
... def even(value):
... return not (value % 2)
>>> even(4)
# Output: True
>>> even(5)
# Output: ValidationError(func=even, args={'value': 5})
Args:
func:
Function which is to be decorated.
Returns:
(Callable[..., ValidationError | Literal[True]]):
A decorator which returns either `ValidationError`
or `Literal[True]`.
> *New in version 2013.10.21*.
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