From: "Nicolas V." <lists@...>
Date: 2013-03-21T19:00:07+09:00
Subject: Re: Ruby tainting on primitives

Hans Mackowiak wrote in post #1102567:
> did you image how to "upgrade the Fixnum into a Bignum."?
Fair enough, I was wrong.

>
> it does not make sense, cause the world of Integer is parted ... little
> ones are Fixnum, big ones are Bignum.
>
> you cant "upgrade" them so that you get an Bignum with the same value as
> a fixnum, you need a Holder Class for that, and if you use a
> HolderClass, you already have something that can be tainted

Which brings me to this point. I think it would be nice if we could use 
Bignum as HolderClass for Fixnum. For example, `123.to_fixnum` would 
return a Bignum of value 123. Operations involving a tainted Bignum 
would preserve the semantics. For example with an addition: 
BignumTainted + Fixnum -> BignumTainted.

Would it be preferable to implement that HolderClass in userland? or in 
Ruby?

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