On Sat, Apr 29, 2017 at 6:04 PM, Philip McGrath <phi...@philipmcgrath.com>
wrote:

> I think that would be because "the *draw* is called during the dynamic
> extent of the call to dc
> <http://docs.racket-lang.org/pict/Basic_Pict_Constructors.html?q=dc#%28def._%28%28lib._pict%2Fmain..rkt%29._dc%29%29>
> as part of the contract checking."
>

 That explains it!

I think I can take the performance hit — it would be nice to have
fine-grained control of contract-checking for these expensive checks,
though.

Dan

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