[racket] overlay and overlay/xy

I taught from HtDP/2e last semester, using 2htdp/image, and had similar
experiences with my students playing with overlay/xy. I must admit it wasn't
what I expected after using overlay, and I agree with Don. With the caveat
that I'm not concerned about backward compatibility, I would prefer to see
overlay/xy updated to be consistent with overlay, in the way Don described.
Short of this possibility, a revision to the documentation would also be
helpful...  :-)

Thanks to Don for articulating this behavior so well, and to Robby for
soliciting further opinions!

Marc


On Sun, Jan 30, 2011 at 10:33 PM, <users-request at racket-lang.org> wrote:

Message: 4
Date: Sun, 30 Jan 2011 21:04:52 -0600
From: Robby Findler <robby at eecs.northwestern.edu>
To: Don Blaheta <dblaheta at monm.edu>
Cc: "users at racket-lang.org" <users at racket-lang.org>
Subject: Re: [racket] overlay and overlay/xy
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I find this to be a compelling argument but I am worried about
backwards compatibilty for others.

The least I can do is a better job documenting this (and thanks to
your message I think I'll be able to do that) but I'm not sure about
changing the semantics.

Do others that may depend on 2htdp/image have an opinion?

Robby
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