Binary: Put -> Builder

[Don Stewart]

ross:
> On Thu, Feb 12, 2009 at 07:28:07AM -0800, Don Stewart wrote:
> > ross:
> > > Here's a concrete suggestion: have Data.Binary.Put export the existing
> > > function
> > > 
> > >   tell :: Builder -> Put
> > > 
> > > and also
> > > 
> > >   execPut :: PutM a -> Builder
> > >   execPut = sndS . unPut
> > 
> > What's the use case?
> 
> Quoting a previous message:
> > I imagine one might want to make a Builder for a composite object,
> > using the Binary instances of some types.  And one might want to go
> > the other way too, defining a Binary instance using an existing Builder.

Sounds good. Do you just want these exposed as is?

-- Don