exclamation mark in password is swallowed by sbt.bat

[vincent-fuchs]

steps

I have configured my proxy related config in sbtconfig.txt - my password contains an exclamation mark

-Dhttps.proxyHost=myProxy
-Dhttps.proxyPort=8080
-Dhttps.proxyUser=vincent
-Dhttps.proxyPassword=MyPasswordHas!ExclamationMark

problem

When I launch sbt and check the logs, I see the exclamation mark has disappeared :

setting 'https.proxyPassword' to 'MyPasswordHasExclamationMark'

expectation

The password should be used by SBT as configured. This issue is particularly tricky, as no message in the log says that proxy authentication failed.

notes

This thread seems to show a related issue, that has to do with the @SETLOCAL enabledelayedexpansion that is used at the beginning of sbt.bat :
http://stackoverflow.com/questions/3288552/how-can-i-escape-an-exclamation-mark-in-cmd-scripts

I've tried to update the password to various values, with carrets and/or quotes, but I haven't been able to find the right combination.