Proposal (base): Add new Exp constructor to Text.Read.Lex.Lexeme

[Yitzchak Gale]

Gracjan Polak wrote:
> Core of proposal: Add
> data Lexeme
>  ...
>  | Exp Integer Integer -- ^ Floating point literal in exponential form a*10^b
> Currently when parsing 12e1000000000000 it is at some
> point represented as Rational...
> I needed to change public interface of
> Text.Read.Lex to get it fixed.

+1 for doing whatever is needed to fix this,
and promptly.

I defer to the opinions of those more
intimately familiar with GHC internals about
whether this is the right way to do it.

Thanks for pushing this forward!

-Yitz