Commit c96dde98f3a0a816173943a20b47447de8eb124a introduced a regression to message formatting and throwable handling.

To locate this commit yourself:
1. Put attached LoggerMessageFormattingRegressionTest.java into logback-classic/src/test/java/ch/qos/logback/classic.
2. Put attached bisect.sh into repository root and make it executable.

git bisect start
git bisect good 6c06412cab0e634f7410ff619fb92fe663ca5058
git bisect bad 8c26f3b32cb386b1c1c3ae8dd14c6cf65c2c2578
git bisect run ./bisect.sh

"param1={}, param2={}, param3={}, exceptionString={}" with params

new Object[]{"One", "Two", "Three", new RuntimeException("Exception-Message")}

returns
"param1=One, param2=Two, param3=Three, exceptionString={}" and has a ThrowableProxy
instead of returning
"param1=One, param2=Two, param3=Three, exceptionString=java.lang.RuntimeException: Exception-Message" with no ThrowableProxy.

I have some more complaints about message formatting behavior but this one is an actual regression.