[plt-scheme] read-decimal-as-inexact

Somewhere between v209 and v301, read-decimal-as-inexact was changed.

I used to be able to set it to #f in my .mzschemerc or in a module,
but now if I set it #f in a module, it is still #t in my main file.

Strangely, print-graph and print-struct don't have this problem, and
I can set them in other files.

Is this a bug or a "feature"?

--rocky