himīśā

I see some strange (and seems intended) behavior when self-move-assigning `_Node_handle`: https://github.com/microsoft/STL/blob/2e27f1f05a155bb3637dad04b4d9c4c4590c8542/stl/inc/xnode_handle.h#L128-L131 This, while following what [standard](https://eel.is/c++draft/container.node.cons#itemdecl:1) said, and does `leave the object in a valid-but-unspecified state`, but also clears...