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S)a�Return whether or not the length of given string is within a specified range.

    Examples:
        >>> length('something', min_val=2)
        # Output: True
        >>> length('something', min_val=9, max_val=9)
        # Output: True
        >>> length('something', max_val=5)
        # Output: ValidationError(func=length, ...)

    Args:
        value:
            The string to validate.
        min_val:
            The minimum required length of the string. If not provided,
            minimum length will not be checked.
        max_val:
            The maximum length of the string. If not provided,
            maximum length will not be checked.

    Returns:
        (Literal[True]): If `len(value)` is in between the given conditions.
        (ValidationError): If `len(value)` is not in between the given conditions.

    Raises:
        (ValueError): If either `min_val` or `max_val` is negative.
    Nr
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