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hash table question

No, it doesn't always return true.  sxhash is an "equal" hash, returning
the same value for equal structures, even if they're not eq.  So the
idea is that it does a tree walk and computes its number out of what it
finds in the leaves.  Since you've changed a leaf and it is no longer
"equal" to what it used to be, it can have a new sxhash value, and
probably does.  This could have been spelled out in more detail in CLtL.