i686 will no longer be a supported platform of Arch Linux. [1]

  This is the second time that I witness an x86 architecture "die".  The
  last time was the death of 80286, which essentially happened with OS/2
  2 and Windows 3.11.

  (Yeah, yeah, it's only Arch. Still important.)

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  1. https://www.archlinux.org/news/phasing-out-i686-support/