WeakMap better than Private Symbols? (was: direct_proxies "problem")

[Kevin Smith]

> They both have their place since there's many uses for both inherited and
> non-inherited private values.
>

Can we see some demonstrated use-cases for which WeakMaps are insufficient,
and private properties are?  I continue to hear that private symbols are a
great idea without any discussion of the tradeoff:  a more complicated (and
more difficult to reason about) runtime object model.

{ Kevin }
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