this was in 7.3.5, not 7.3.6

remicollet · remicollet · commit 9a495911c86f · 2019-06-04T07:19:29.000+02:00
diff --git a/UPGRADING b/UPGRADING
@@ -731,7 +731,7 @@ LDAP:
     is used only when error_log is set syslog.
 
 - mbstring.regex_stack_limit
-  . New INI directive (since 7.3.6) limiting stack depth of mbstring/oniguruma
+  . New INI directive (since 7.3.5) limiting stack depth of mbstring/oniguruma
   regular expressions.
 
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