<match value="0x01" mask="0x0F" type="string" offset="4"/>
      </match>
    </magic>
  </mime-type>
  <mime-type type="application/sereal;version=2">
    <sub-class-of type="application/sereal"/>
    <magic priority="50">
      <match value="0x6C72733D" type="little32" offset="0">
        <match value="0x02" mask="0x0F" type="string" offset="4"/>
      </match>
    </magic>

   * of reads and delaying a lock acquisition until the threshold is crossed or a mutation occurs.
   *
   * <p>This must be a (2^n)-1 as it is used as a mask.
   */
  static final int DRAIN_THRESHOLD = 0x3F;

  /**
   * Maximum number of entries to be drained in a single cleanup run. This applies independently to
   * the cleanup queue and both reference queues.
   */
  // TODO(fry): empirically optimize this

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