@Override
          public void release(byte[] unused) {
            FlexByteArrayPool.this.release(unused);
          }
A special byte-array pool designed to minimize allocations.

<p>The length of each bucket's free list is capped at the number of threads using the pool.

<p>The free list of each bucket uses {@link OOMSoftReference}s.
imagepipeline/src/main/java/com/facebook/imagepipeline/memory/FlexByteArrayPool.java