** New user option 'native-comp-async-warnings-errors-kind'.
It allows control of what kinds of warnings and errors from asynchronous
native compilation are reported to the parent Emacs process. The
-default is to report all errors and only important warnings.
+default is to report all errors and only important warnings. If you
+were used to customizing 'native-comp-async-report-warnings-errors' to
+nil or 'silent', we suggest that you now leave it at its default value,
+and see if you get only warnings that matter.
+++
** New function declaration and property 'important-return-value'.