Hi, I'm learning about tools to help me debug from the REPL, and I found 
these two with the same name:

    clojure.stacktrace/root-cause

    clojure.repl/root-cause

For a very simple case (wrong arity), they give pretty similar output:

    user=> (char 0 0 0)
    CompilerException clojure.lang.ArityException: Wrong number of args (3) 
passed to: core/char--inliner, 
compiling:(/tmp/form-init6819528724684564936.clj:1:1) 

    user=> (clojure.stacktrace/root-cause *e)
    #<ArityException clojure.lang.ArityException: Wrong number of args (3) 
passed to: core/char--inliner>

    user=> (clojure.repl/root-cause *e)
    #<CompilerException clojure.lang.ArityException: Wrong number of args 
(3) passed to: core/char--inliner, 
compiling:(/tmp/form-init6819528724684564936.clj:1:1)>


I looked at the source code and they look fairly similar, but I didn't 
understand the exact details.

If they do the same job, then which one does it best?

If they perform different roles, then could you describe the difference to 
a user who doesn't need to understand the internals? ( I'm happy to 
understand them if you are willing to explain, though :) )

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