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It is already setup in the spacemacs layer.

This is a user preference.

- C-c C-m is used for macroexpanding in Cider
- C-c C-f is used for pprint-eval-defun
- The latter is the default recommendation from clj-refactors README
- I think macroexpansion arguably more important, but it's debatable

cider-jump-back is handy
cider-jump is deprecated since cider 0.7.0 and is currently only an alias for cider-jump-var
[https://github.com/clojure-emacs/cider/blob/b661d1019980bb4e4452b4c62b5378f901a33e59/cider-interaction.el]

Used to turn on fancify-symbol (default value is nil, i.e. disabled)

Refactoring aims at eliminate redundancy of sexp where
it is possible.