Sounds like your idea is focused on reclamation of names after a rename. While a possible idea to explore separately, it isn't one of the use cases we are targeting in Survey of organizational ownership and registry namespace designs for Cargo and Crates.io - #4 by epage. If you think it should be included, that is likely a conversation for that thread. We do talk about the need to recognize that names outside of the registry are mutable and need a scheme to support that for some potential solutions like in Survey of organizational ownership and registry namespace designs for Cargo and Crates.io - #4 by epage but that is focused on the transition path and not reclamation and could have conflicting syntax.
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