Eagerly set a pointer to nil to help GC #1232
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| I think bytes.Buffer memory allocation strategy is good for this ! |
dfawley approved these changes May 12, 2017
menghanl added 1.4 Type: Performance 
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Addresses #1231
Perhaps encapsulating this behavior in a circular
queueobject and using that instead of direct slice manipulation would be the way to go in a future refactoring.