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what is `self-typing' ?

From: waterloo
Subject: what is `self-typing' ?
Date: Sat, 26 Dec 2009 15:53:47 +0800

I can not understand a para in Elisp manual :
Lisp is unlike many other languages in that its objects are
"self-typing": the primitive type of each object is implicit in the
object itself.  For example, if an object is a vector, nothing can
treat it as a number; Lisp knows it is a vector, not a number.

What is `self-typing' ? thanks

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