On Feb 8, 3:22 am, Stuart Halloway <[email protected]> wrote:
> IMO Anything that implements IDeref should adhere to Clojure's vision  
> for identity, e.g. reads need to be thread safe, cheap, require no  
> coordination, and block no one.

Dereferencing futures or undelivered promises block the dereferencing
thread though, so potentially blocking derefs should not be a problem.
With side-effects in the deref operation, you would have to ensure
that it's safe from multiple threads, though.

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