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src: add HandleScope in HandleWrap::OnClose
Fixes a 4 byte leak on handles closing. AKA The Walmart leak. MakeCallback doesn't have a HandleScope. That means the callers scope will retain ownership of created handles from MakeCallback and related. There is by default a wrapping HandleScope before uv_run, if the caller doesn't have a HandleScope on the stack the global will take ownership which won't be reaped until the uv loop exits. If a uv callback is fired, and there is no enclosing HandleScope in the cb, you will appear to leak 4-bytes for every invocation. Take heed. cc @hueniverse
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