Will read.-

  PS. "Permutation City" was how I first found out about Egan. Appears to be the "gateway drug" :)
  ... and a great tale.-

Interestingly, Egan pokes some holes in his own work here: https://gregegan.net/PERMUTATION/FAQ/FAQ.html (spoiler warning) and I think is all the more credible for doing so, totally on brand for a hard sci-fi author.