[prometheus pants (master)]$ ./pants repl -h --help-advanced|grep -A 1 '\-options'
--jvm-repl-scala-options=<option>... (--jvm-repl-scala-options=<option>...) ... (default: ['-Xmx1g','-XX:MaxPermSize=256m','-Dscala.usejavacp=true'])
    Run with these extra JVM options.