MooseX::ClassAttribute: read-only outside, writable inside

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I'm very new to Moose, and I'm probably missing something very simple.

Does anyone have examples of code that
- provides a class attribute via MooseX::ClassAttribute
- that class attribute is readable but not changable by the outside
- that class attribute can be changed within the package itself?

In my case, I have a class of objects that each have an integer key
(set once at new() time, never changed thereafter).  I'd like to
provide to the user of the class a way to get the minimum key so far
and the maximum key so far, but I don't want them to be able to change
it.  Within the package, though, I need to conditionally update max
and min at every object creation (currently, I'm using "sub BUILD" to
catch the event).

I have a basic notion of how to do it outside Moose, but I'd like to
do it "the usual Moose|MooseX way", especially as they may handle
grungy details that I know nothing about, such as correct inheritance.

Tim McDaniel,

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