class_docstr: In certain situations you need to be able to represent a case where a default value has
  to be explicitly removed and `None` is not an appropriate substitute, for example:
  
  ```py
  # as the default `Content-Type` header is `application/json` that will be sent
  client.post("/upload/files", files={"file": b"my raw file content"})
  
  # you can't explicitly override the header as it has to be dynamically generated
  # to look something like: 'multipart/form-data; boundary=0d8382fcf5f8c3be01ca2e11002d2983'
  client.post(..., headers={"Content-Type": "multipart/form-data"})
  
  # instead you can remove the default `application/json` header by passing Omit
  client.post(..., headers={"Content-Type": Omit()})
  ```
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code: def __bool__(self) -> Literal[False]:
      return False
  
imports: from __future__ import annotations
  from os import PathLike
  from typing import IO, TYPE_CHECKING, Any, Dict, List, Type, Tuple, Union, Mapping, TypeVar, Callable, Optional, Sequence
  from typing_extensions import Literal, Protocol, TypeAlias, TypedDict, override, runtime_checkable
  import httpx
  import pydantic
  from httpx import URL, Proxy, Timeout, Response, BaseTransport, AsyncBaseTransport
label_desc: Use image node_id 1 for calling the Omit obj's underlying member method code with example usage: obj.__bool__() and returns: False