+- .als only works for macros in mandoc, not for user-defined strings.
+ Also, the "val" field in struct roffkv would have to be replaced
+ with a pointer to a reference-counted wrapper, and an alias
+ would have to point to the same wrapper as the original.
+ .als to undefined does nothing; the alias is not created.
+ .rm'ing the original leaves the alias to point to the old value.
+ .de .als .de changes both, but
+ .de .als .rm .de only changes the new value, not the alias.
+ Found in groffer(1) version 1.19
+ Jan Stary 20 Apr 2019 20:16:54 +0200
+ loc * exist ** algo ** size ** imp *
+
+- roff string condition comparisons fail when vars contain quotes:
+ .ds s '
+ .if '\*s'' \&...
+ hard to fix because of the basic architecture (string replacement
+ happens before roff(7) syntax parsing)
+ Found in groffer(1) version 1.19
+ Jan Stary 20 Apr 2019 20:16:54 +0200
+ loc * exist *** algo *** size ** imp *
+