Follow-up Comment #15, bug #65716 (group groff):

[comment #14 comment #14:]
> # See "groff:" comments for altered mappings.
> 
> The final line infers there may be specific changed mappings,
> but none are currently annotated.

Huh, I see three annotated lines in the current version of the file:

$ fgrep groff: src/utils/afmtodit/afmtodit.tables
# See "groff:" comments for altered mappings.
  "Delta", "0394", # groff: not U+2206
  "Omega", "03A9", # groff: not U+2126
  "mu", "03BC", # groff: not U+00B5

And the annotations seem to have been there a while:

$ git blame src/utils/afmtodit/afmtodit.tables | fgrep groff:
Blaming lines: 100% (6375/6375), done.
f04365c2b3 (G. Branden Robinson 2022-05-25 21:13:35 -0500 2092) # See "groff:"
comments for altered mappings.
423b0080ea (G. Branden Robinson 2020-09-02 22:39:42 +1000 2201)   "Delta",
"0394", # groff: not U+2206
423b0080ea (G. Branden Robinson 2020-09-02 22:39:42 +1000 2530)   "Omega",
"03A9", # groff: not U+2126
423b0080ea (G. Branden Robinson 2020-09-02 22:39:42 +1000 4752)   "mu",
"03BC", # groff: not U+00B5

Furthermore, [http://git.savannah.gnu.org/cgit/groff.git/commit/?id=423b0080e
commit 423b0080e] makes it clear that these three modified mappings aren't
new, just the way they're annotated.  Relevant excerpt:

-# This table has been algorithmically derived from the file glyphlist.txt,
-# version 2.0, available from partners.adobe.com, on 2005-12-09.  For glyphs
-# 'Delta', 'Omega', and 'mu', the values have been manually changed to the
-# ones from aglfn.txt, version 1.6.
+# This table has been algorithmically derived from the file
+# glyphlist.txt, version 2.0, available from partners.adobe.com,
+# on 2020-09-02.  See "groff:" comments for altered mappings.




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