Admin console: missing validation on JVM arguments

It is currently possible to set invalid JVM arguments for a server instance or group, as seen in the attached screenshot. The input field designating heap size and maximum heap size should be somehow reworked, made more intuitive, at least the help should show more information on what you can put in. If you enter an invalid value, the operation will succeed, the invalid value will be used after the domain is restarted, and causing related servers to NOT BOOT UP.