[Bug 264559] unexpand: nonconformantly (to both POSIX and heirloom) replaces single spaces with tabs, sometimes breaking reversibility

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264559

--- Comment #2 from наб <nabijaczleweli@nabijaczleweli.xyz> ---
Some more, this time /exorbitantly/ broken:
  printf ' ermrxsmg \tjrjc ngsoo\n' | unexpand -t2          | cat -A
  printf ' ermrxsmg \tjrjc ngsoo\n' | unexpand -t4,55,68,78 | cat -A
give
  | ermrxsmg^I^Ijrjc ngsoo$
  |^Iermrxsmg^Ijrjc^Ingsoo$
whereas the correct output is
  | ermrxsmg ^Ijrjc ngsoo$
  | ermrxsmg ^Ijrjc ngsoo$

After reexpansion, the first one is fine:
  | ermrxsmg   jrjc ngsoo$
but the second one very obviously isn't:
  |    ermrxsmg                                           jrjc         ngsoo$

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