[racket] windows-1252 charset decoding

On Wed, Mar 4, 2015 at 3:06 PM John Clements <johnbclements at gmail.com>
wrote:

> I see that the documentation suggests that (entity-charset) is supposed to
> return a symbol. However, it nearly always returns a string. In particular,
> it appears to me that it returns a symbol only when it returns its default,
> 'us-ascii.
>
> I feel compelled to repair this, but there are two ways to fix it:
> 1) make it match the docs and always return a symbol, or
> 2) change the docs and the default to return a string.
>
> It looks to me like #2 will break (less) code, though it's certainly
> possible that people depend on the default value's being a string.
>

It seems like option #3, document the current behavior, will break the
least code, and that we should do that.

Sam
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