Nathan Wall wrote:
In the case of (1), the implementation using a private symbol will have 
internal accesses to the `timestamp` symbol exposed through the 
unknownPrivateSymbol trap.

Private symbols do not trap.

In the case of (2), the implementation using a private symbol will fail on a 
call to `setTime` when the object is frozen (I think).

Nope, we agreed that frozen objects support setting pre-existing (added before the object was made non-extensible) properties named by private symbols.

/be
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