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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import typing as ty
# Workaround Python's lack of an undefined sentinel
# https://python-patterns.guide/python/sentinel-object/
class Unset:
def __bool__(self) -> ty.Literal[False]:
return False
UNSET: Unset = Unset()
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