Ensure that interruption of concurrent get doesn't cause deadlocks in other threads
#174
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/fixes #172
The main change is that instead of relying on
suspendSucceedand manual interruption handling, we wrap everything in anuninterruptibleMaskand userestore(...)only on parts that we wish to be be interruptible. This way we don't run into race conditions where we might get an interruption just before we evaluate an effect that ends inonInterrupt