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Merge #117

117: Fix deadlocks when futures outlive executor r=rohanpm a=rohanpm

Let futures hold a strong reference to their executor until
completion, otherwise the futures may never be resolved.

Clearing the reference when the future completes avoids keeping
threads alive longer than needed.

Fixes #114

Co-authored-by: Rohan McGovern <rohan@mcgovern.id.au>

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