Tiny JSON performance improvement
Get rid of some needless uses of apply. Measuring with (benchmark-run 10 (json-read-file "test.json")) showed 1.5-2.5% reduction of execution time. * lisp/json.el (json-peek): Nix let-binding. (json-read-string): Use concat for making a string from chars. (json-read-array): Use cond and more appropriate conversion instead of blindly applying.
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