With some trickery, you can even implement atoms with property lists, type safe but dynamically typed of course. See the code below. (Warning: the implementation of properties is a real mind-twister, using a folklore trick to implement dynamics using references and functions that I learnt from Daniel de Rauglaudre, although it's been reinvented independently quite a number of times.)http://caml.inria.fr/archives/200105/msg00175.html
"real mind-twister" hack
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