can not :write-attribute expression values

socket bindings return on read expression in the form {"EXPRESSION_VALUE":"${foo:123}"}

[standalone@localhost:9999 socket-binding=management-http] :read-attribute(name=port)
{
"outcome" => "success",
"result" => expression "${jboss.management.http.port:9990}"
}

First this is confusing, as the description describes the port as int:

[standalone@localhost:9999 socket-binding=http] :read-resource-description
{
"outcome" => "success",
"result" => {
"description" => "Configuration information for a socket.",
"attributes" => {
"port" =>

{ "type" => INT, "description" => "Number of the port to which the socket should be bound.", "expressions-allowed" => true, "nillable" => false, "min" => 0L, "max" => 65535L, "access-type" => "read-write", "storage" => "configuration", "restart-required" => "all-services" }

,

I can still work around this in json-land by having the expression toString()'d and then remove the

{EXPRESSION_VALUE=..}

part around it.

Now writing back an expression does not work:

[standalone@localhost:9999 socket-binding=management-http] :write-attribute(name=port,value=${jboss.management.http.port:19990})
{
"outcome" => "failed",
"failure-description" => "JBAS014688: Wrong type for port. Expected [EXPRESSION, INT] but was STRING",
"rolled-back" => true
}

Same applies to json-interface when I do a write-attribute call with {name="port",value="${...}"} as payload
Operation <CompositeOperation

{steps=23}

> returned <"JBAS014688: Wrong type for port. Expected [EXPRESSION, INT] but was STRING","rolled-back":true},