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[plt-scheme] 4.0 question

From: Prabhakar Ragde (plragde at uwaterloo.ca)
Date: Sat Dec 15 20:39:57 EST 2007		 
Why are cons cells immutable by default but structures mutable by 
default? And did you consider making definitions immutable by default, 
that is, having both (define <var> <exp>) and (mdefine <var> <exp>) 
forms? --PR
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