[racket] Saving and restoring many parameters

On Oct 19, 2011, at 9:29 AM, John Clements wrote:

> 
> On Oct 19, 2011, at 4:03 AM, Robby Findler wrote:
> 
>> (I'm sorry if you got this message already; I thought I sent it
>> already but I don't see it.)
>> 
>> What about the current-output/error-port? what about the
>> current-namespace? current-custodian?
>> 
>> There are lots of parameters that affect core functions in subtle ways
>> and if you do something like this in plot, it seems like it could lead
>> to serious confusion someday. Also, it can introduce leaks.
> 
> +1. I think this is not not not a good idea.
> 
> Robby's solution requires you to make one list of all of the plot-related parameters, which looks to me like the "right" amount of work.
> 
> Furthermore, it has the unpleasant characteristic that when it breaks, it will be exposed in an unwanted change to a parameter that will likely be entirely unrelated to plot. Tracking this down will be horrible, and the axe-wielding murderer of legend will be very unhappy when he (or she?) finally gets to your doorstep.

Dangling pronoun. Of course, I meant to say

"Furthermore, [your solution] has the unpleasant characteristic..."

John

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