;; BigDecimal comparisons do not appear to work as I
;; would have expected them to:
(= 2e+3M 2000M) ;; -> false
;; Looking at the definition of '=', I can see that
;; it defers to clojure.lang.Util/equiv, which
;; compares them as Object, by reference. Fine.
;; I thought I could use equals, but that one is
incorrect too:
(.equals 2e+3M 2000M) ;; -> false
;; because the "scale" of these two objects is
;; different, and BigDecimal requires the scale to be
;; the same:
(map #(.scale %) [2e+3M 2000M]) ;; -> (-3 0)
;; Fine then; I'll use compare:
(= 0 (compare 2e+3M 2000M)) ;; -> true
;; This still leaves me with a problem: what I really
;; want to do is compare data structures which
;; contain instances of BigDecimal:
(= {:USD 2e+3M} {:USD 2000M})
;; -> false, for the same reasons as above
(compare {:USD 2e+3M} {:USD 2000M})
;; PersistentArrayMap is not Comparable
;; What is the idiomatic way to do this, in general?
;; Should I just give up and define a comparison
;; method that will work ONLY for the data structures
;; I'm expecting to see? (e.g. "maps with values that
;; are all Comparable")
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