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This is taken from the comments in searialize.lisp, is it still true?<BR>
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What do we do when we serialize an object and it turns out to contain<BR>
other objects? There are a few options:<BR>
1. Don't allow it: this should be dealt with at a higher level<BR>
2. Automatically add the child object to the cache: that means it<BR>
will be saved and we'll get an object-id for the child. But what if<BR>
the child was already in the cache? We have no way of knowing that<BR>
and we'll probably create a mess.<BR>
3. Just serialize the contents. This basically assumes that this is the<BR>
only reference to this objects; or, if it isn't, that it doesn't matter<BR>
if we create more than one copy of this object when we deserialize<BR>
it (and that object identity is irrelevant).<BR>
I think I'll go for option 3.
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