find: move miscapitalization responsibility to findHelper preview

repeat errored by-name references as though capitalization-fuzzy;
if there's then a match, this is a capitalization error

interacts with the same fuzzy cache as when quering this data
capitalization-fuzzy from any other external entry. this probably
consumes extra long-lasting memory (cache) in cases where no fuzzy
search would be performed - though only if there are failed refs
to double-check in the first place

(however, there ARE expected failed refs in mixed-find uses, so
 real normal memory footprint is possibly increased there.)

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