FirewallD randomizing outbound IPv6 source IP selection

direct.xml

<?xml version="1.0" encoding="utf-8"?>
<direct>
  <!-- probability: P(i) = 1 / (N - (i - 1)) -->
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.0625 -j SNAT --to-source 2::::::0</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.0667 -j SNAT --to-source 2::::::1</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.0714 -j SNAT --to-source 2::::::2</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.0769 -j SNAT --to-source 2::::::3</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.0833 -j SNAT --to-source 2::::::4</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.0909 -j SNAT --to-source 2::::::5</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.1000 -j SNAT --to-source 2::::::6</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.1111 -j SNAT --to-source 2::::::7</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.1250 -j SNAT --to-source 2::::::8</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.1429 -j SNAT --to-source 2::::::9</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.1667 -j SNAT --to-source 2::::::a</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.2000 -j SNAT --to-source 2::::::b</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.2500 -j SNAT --to-source 2::::::c</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.3333 -j SNAT --to-source 2::::::d</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 0.5000 -j SNAT --to-source 2::::::e</rule>
  <rule ipv="ipv6" table="nat" chain="POSTROUTING" priority="0">-m statistic --mode random --probability 1.0000 -j SNAT --to-source 2::::::f</rule>
</direct>