- imapping-find takes pred :: value -> generalize-boolean

- imapping-find/key takes pred :: key, value -> generalized-boolean

The '/key' suffix is consistent within srfi-224, but I'm worried that srfi-146 (scheme mapping) has mapping-find and hashmap-find, in which the predicate takes a key and a value. 

For inter-srfi consistency, we'd expect imapping-find takes a predicate with two arguments.

Would it bother too much if *-find deviates from '/key' suffix rule?

By the way, here's my survey on the find/any/any? operations in various srfis: