Alter or ref-set a ref after commute would throw a
IllegalStateException:Can't set after commute

for example:

user=> (def counter (ref 0))
#'user/counter
(dosync (commute counter inc) (ref-set counter 3))
java.lang.IllegalStateException: Can't set after commute
(NO_SOURCE_FILE:0)

I want to know why this should not happen?is it a explanation here? I
can't understand what is the difference with  commuting ref  after ref-
set or alter.Thanks a lot.

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