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[plt-scheme] prop:custom-write, lists operations

From: Yoav Goldberg (yoav.goldberg at gmail.com)
Date: Fri Oct 14 07:50:25 EDT 2005		 
Hi,

Where can I find documentation about the prop:custom-write property?
What parameters does it take?

And another question: does "length" work in O(1) or O(n)? How about "append"?


Thanks,
Yoav
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