typos (from a quick surface scan; I'm not familiar with Clojure or this package):

"The description arity takes the current state ..." should be "The transition arity takes the current state ..."

"excepiton" should be "exception"

"Exceptions thrown from the transition or transform arities, the exception ..." should be "If exceptions are thrown from the transition or transform arities, they ..."

"provded" should be "provided"

Fixed, thx.