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<show> parameter

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From: soo <tilde@xxxxxxxxxxx>
Subject: Re: a preface
Date: 25 Mar 2004 21:33:24 +0900

>  * From: David Van Horn <dvanhorn@xxxxxxxxxx>
> >> |And further, why are you allowed to pass in only display or write?
> FMT needs only display and write. 

I might want to pass write-with-shared-structure (srfi-38),
in case if object has circular reference.  Or to pass
my own version of write, which uses special formatting for
certain objects, suitable for my application.

I don't see what fmt gains by limiting <show> parameter to
display and write.