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> It's quite natural: instead of "referenced" think about a key as
> "reproducible".  I can reconstruct numbers, booleans and strings
> *identically* from thin air at any time.  This does not hold for other
> collectable types.  For weak valued tables there is a nice analogy:
> these can be thought of as functions.  If you cannot reproduce a
> certain input, it's pointless to keep the output.


-- Roberto