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venv/lib/python3.9/site-packages/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