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UA.GetAllRandom() performance improvements #3

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@pymq pymq commented Dec 2, 2019

Thanks for this library!

I noticed two drawbacks and prepared a fix, please consider this for merging.

  • remove unnecessary slice allocations on each UA.GetAllRandom() call (about 3000 length slice on average);
  • add RWMutex to prevent data races;

…about 3000 length slice);

add RWMutex to prevent data races
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