The read/write handlers here work the same as AliasResourceTestCase. The consistency check in "add" at xhttps://github.com/wildfly/wildfly/pull/5640/files#diff-938631ee0437d9393e6c153cdae5b470R167 is still relevant though as users could include both attributes as params.

AFAICT the only effect of the ALIASES flag is it triggers excluding the attribute from read-resource result unless include-aliases=true is set. Which means existing clients will break until they add that param.