D8688.id.diff
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	diff --git a/swh/model/model.py b/swh/model/model.py
	--- a/swh/model/model.py
	+++ b/swh/model/model.py
	@@ -326,7 +326,15 @@
	if validator is not None:
	f = f.evolve(validator=validator)
	new_fields.append(f)
	- return new_fields
	+ if attr.__version__ < "21.3.0":
	+ # https://github.com/python-attrs/attrs/issues/821
	+ from attr._make import _make_attr_tuple_class
	+
	+ attr_names = [f.name for f in new_fields]
	+ AttrsClass = _make_attr_tuple_class(cls.__name__, attr_names)
	+ return AttrsClass(new_fields)
	+ else:
	+ return new_fields


	ModelType = TypeVar("ModelType", bound="BaseModel")