In r59144 , a bunch of internal-use constants were dumped in the main
namespace.  These all need to be prefixed with an underscore.  

They should be fixed right-away before people start using them.  Since
they are externally undocumented and since the internal notes describe
them as being only for internal-use, I think this can go in as a bugfix.

Mark, it looks like r59144 merely moved these around and that they
existed beforehand.  Can we go ahead and get them renamed?  They are
defeating the extensive efforts we've made to keep that namespace free
of anything that isn't part of the documented spec.

I assume you're referring to Dec_0 and friends?

Fixed in the trunk in r68182.  Leaving open until I get the chance to 
merge it to the other branches.

Thanks.  BTW, my preferred new names are _One _Zero and _NegativeOne.
Names like dec_n1 are cryptic in places other than where they're defined.

Fine.  Will re-rename in the morning.  Are _Inf, _negInf, _NaN and 
_Infsign okay as they are?

Let's spell them out:  _Infinity, _NegativeInfinity, _NaN, and
_SignedInfinity.

Done (r68191 through r68194).