On Mar 6, 2015, at 5:18 PM, sivsushruth <sivsushr...@gmail.com> wrote:

> I was checking out 
> https://github.com/rails/rails/blob/master/activesupport/lib/active_support/xml_mini.rb#L152
>  
> It has: TODO: Add support for other encodings
> 
> So, I googled a bit and found this: http://base91.sourceforge.net/ 
> On initial investigation, this seems a pretty good alternative to base64
> 
> I feel this might be of good value to a lot of developers.
> If you guys feel the same way, I will be more than happy to get started on 
> this.

Is there any evidence that base91 is used “in the wild”? References to it are 
very light on Google etc; for instance, Wikipedia only mentions it as an 
“external link” on the Ascii85 page.

It’s also going to be tricky to embed in XML, since it uses several characters 
that XML reserves (<, &, > and ") which will require escaping. That appears to 
have been addressed in a variant (https://github.com/r-lyeh/base91) which uses 
a different set of characters.

—Matt Jones

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