Sandbox::https://redirect.github.com/scorability/sqlmodel/blob/main/sqlmodel/default.py

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from typing import Any, TypeVar

class _DefaultPlaceholder:

"""

You shouldn't use this class directly.

It's used internally to recognize when a default value has been overwritten, even

if the overridden default value was truthy.

"""

def __init__(self, value: Any):

self.value = value

def __bool__(self) -> bool:

return bool(self.value)

def __eq__(self, o: object) -> bool:

return isinstance(o, _DefaultPlaceholder) and o.value == self.value

_TDefaultType = TypeVar("_TDefaultType")

def Default(value: _TDefaultType) -> _TDefaultType:

"""

You shouldn't use this function directly.

It's used internally to recognize when a default value has been overwritten, even

if the overridden default value was truthy.

"""

return _DefaultPlaceholder(value) # type: ignore