Bugfix (introduced: postfix-2.11): with posttls-finger,
connections to unix-domain servers always resulted in "Failed
to establish session" even after a connection was established.
Jaroslav Skarva.  File: posttls-finger/posttls-finger.c.

Bugfix (introduced: Postfix 3.0): with smtputf8_enable=yes,
table lookups could casefold the search string when searching
a lookup table that does not use fixed-string keys (regexp,
pcre, tcp, etc.). Historically, Postfix would not case-fold
the search string with such tables. File: util/dict_utf8.c.

Cleanup: when the master daemon runs with PID=1 (init mode),
reap orhpan processes from non-Postfix code running in the
same container, instead of terminating with a panic. File:
master/master_spawn.c.