How to use a special character (extended ascii, unicode, ...) in a logging pattern when configured through the CLI ?

Issue

• Unable to use a middle dot (extended ascii) in a logging pattern when configured through the CLI ?
• Unicode character is showing as a '?'
• When trying to setup a logging pattern with a middle dot in it, it is replaced by a question mark. This only happens through the CLI. The following command was used to reconfigure the pattern:

/subsystem=logging/pattern-formatter=COLOR-PATTERN:write-attribute(name=pattern, value="Middle Dot >> · <<  %K{level}%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n")

You will see that a question mark is shown.

Middle Dot >> ? <<  11:36:13,329 INFO  [org.jboss.as] (Controller Boot Thread) JBAS015874: JBoss EAP 6.4.0.GA (AS 7.5.0.Final-redhat-21) started in 315ms - Started 153 of 191 services (57 services are lazy, passive or on-demand)

However, if we replace the question mark in the standalone.xml with a middle dot again, and it works. :

Middle Dot >> · <<  11:41:45,068 INFO  [org.jboss.as] (Controller Boot Thread) JBAS015874: JBoss EAP 6.4.0.GA (AS 7.5.0.Final-redhat-21) started in 3015ms - Started 153 of 191 services (57 services are lazy, passive or on-demand)