Use of "*:"or "," does result in copying. Use of the actual key does not:
$ x = { "b": 4,"a": 3,"d": { "d2": 4,"d1": 3333 },"c": 5 }
$ y = x.d
$ y.d1 = 0
$ print x.format("JSON")
*{ "b": 4,"a": 3,"d": { "d2": 4,"d1": 0 },"c": 5 }*
$ y = x.select("d,")
$ y.d1 = -1
$ print x.format("JSON")
*{ "b": 4,"a": 3,"d": { "d2": 4,"d1": 0 },"c": 5 }*
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