Hi,

shouldn't StopIteration, ForwardToTarget from "Notification proxies" thread and similar ones be rather well-known unique symbols (like @iterator), now that we have them, instead of well-known globals?

On the more general line, I got pretty fond of (unique) symbols, they seem like very good things for these sentinel-like objects. Is it ok / preferable to use them for that? No need to use empty objects bearing only their identity any more, imo.

Herby
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