I've always liked the way assoc and dissoc return the original map instance
when there's no change to be made. But this is not apparently true of
records. e.g.:
> (def m {:a 1})
> (identical? m (dissoc m :x))
; true
> (def r <<a record with an "a" field>>)
> (identical? r (dissoc r :x))
; false
Does anyone know if there's a good reason for this?
Cheers,
Matthew.
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