Howdy data-science. Posting here 'cause I don't know if there's a better place to ask. Playing around with ham-fisted and ran into class ham_fisted.UnsharedHashMap cannot be cast to class ham_fisted.Reducible, while running this (see snippet). Any ideas what could be going on here?

The error doesn't occur immediately, for instance if I call (take 100) prior to frequencies.