Is the "else" part of orElse called when a transaction is retried due to another transaction writing to a TVar it had read, or only when retry is explicitly called?
Haskell: TVar: orElse
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If you have
then
bis only run ifretryis called explicitly ina. OtherwiseorElsewould essentially become nondeterministic. (The rerunning of transactions that is done by the STM runtime is transparent and should not effect the outcome of any computation.)