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The only thing a `OnceMap` really needs to be able to do with the value is to clone it. All extant uses benefited from having this done for them by automatically wrapping values in an `Arc`. But this isn't necessarily true for all things. For example, a value might have an `Arc` internally to making cloning cheap in other contexts, and it doesn't make sense to re-wrap it in an `Arc` just to use it with a `OnceMap`. Or alternatively, cloning might just be cheap enough on its own that an `Arc` isn't worth it. |
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