I didn't observe this issue in practice, but since the write_only version of the attribute API isn't meant to initialize trivial types, theoretically this could be a problem if the attribute is created halfway through converting the BMesh to a Mesh.
I didn't observe this issue in practice, but since the write_only version of the attribute API isn't meant to initialize trivial types, theoretically this could be a problem if the attribute is created halfway through converting the BMesh to a Mesh.