Date's don't default to ISO formatting when in the key position

[fivetran]

generate-string formats dates as strings. But it does that differently when the same date is in the key versus value position:

(require 'cheshire.core)
(import 'java.util.Date)
(def now (Date.))
(cheshire.core/generate-string {now now})

=> "{\"Thu Apr 17 15:39:35 PDT 2014\":\"2014-04-17T22:39:35Z\"}"

This is surprising.

[michaelklishin]

My guess is that keys are simply coerced to strings.

[dakrone]

This is because keys are assumed to be either "stringy", or as keywords. So the key Date is just having .toString called on it.

[dakrone]

See: https://github.com/dakrone/cheshire/blob/master/src/cheshire/generate.clj#L67-L69