Persistent Immutable Data Structures

I brought this topic up in the group. I won’t retype everything but I think there is advantage to using Immutable data structures in bug prevention and ease of use. There is an ever so slight performance penalty, but I would like to propose that this be included in the lucee language in some form or another.
https://groups.google.com/forum/#!topic/lucee/wP2ZF0G0fps