[racket] Racket v5.3.1

From: Laurent (laurent.orseau at gmail.com)
Date: Thu Nov 8 02:39:56 EST 2012

Yet another awesome release.

> * The `case' form dispatches on characters, fixnums, symbols, and
>   keywords in logarithmic time.  (Thanks to Jon Zeppieri.)

No hidden constant for small dispatchers compared to the previous version?

> * The new `racket/format' library provides new and improved
>   string-formatting functions.

yay! These are very handy.

> * Logging tools include improved filtering support based on the name
>   of a logger.  A new `define-logger' form simplifies the use of
>   named loggers.  Forms such as `log-debug' now support string
>   formatting.

The docs say:
  The default is "none" for Unix or "error" for Windows and Mac OS X.

Why such a difference?
Also, I don't see a 'none level, is there one?

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