Serial by chaining - #59
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Proposed new Serial implementation follows previous one. The distinct part is its based on chaining of gates.
Two Deferred being used, first as gate and second as result awaitable. Gate's concern only on sequential execution, so next computation starts only after previous has been completed. Whereas awaitable concern is only on delivering computed value. Separating those allows gc to reclaim memory since ref owns only a gate of Unit, whereas awaitable being handed over to caller.