The Clojure persistent data structures are truly immutable - all fields are 
final and referred objects are not mutated after construction so that 
freeze occurs.  One obvious exception are the transient variants 
(http://clojure.org/transients). You can look at the code 
in https://github.com/clojure/clojure/tree/master/src/jvm/clojure/lang - 
any of the Persistent*.java.

On Tuesday, May 6, 2014 4:11:49 PM UTC-5, Mike Fikes wrote:
>
> Are the persistent immutable data structures in Clojure "truly" immutable 
> (using final fields, relying on constructor freezing), or are they mean to 
> be merely effectively immutable (as defined in JICP)?
>

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