HexChat supports the UTF8-only spec in Git.

sadiepowell · web-flow · commit d7c8f2137dd4 · 2021-08-24T08:23:10.000+10:00
diff --git a/_data/sw_clients.yml b/_data/sw_clients.yml
@@ -133,6 +133,7 @@
           server-time:
           setname: Git
           userhost-in-names:
+          utf8only: Git
         SASL:
           - external
           - plain
