Fix garbage collection of scandir reqs #696
Merged
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This is one possible approach to solving this. I'd like to test it a bit more and reproduce the crash in #694 (comment) to make sure this fixes it before merging.
Return a userdata wrapper around the uv_req_t to allow it to be garbage collected before the program exits. Previously, the returned userdata held a reference to itself in the Lua registry, meaning it would never be able to be garbage collected until the process ended.
This reverts commit 0e4a895, which attempted a workaround for the same underlying problem, but introduced a use-after-free.