You started the thread about what to call the node, but what about its GUC?
Should it be enable_result_cache instead of enable_resultcache?
See also Robert's opinion last year about enable_incrementalsort and "economizing on underscores".
https://www.postgresql.org/message-id/flat/CA%2BTgmoazhPwebpOwNbHt1vJoos1eLYhJVQPka%2BpptSLgS685aA%40mail.gmail.com#e6d5ea0a10384d540b924688c6357b21
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Justin