Add 'e' to Floating typeclass

[Carter Schonwald]

either way, we're not gonna add e :)

On Wed, Feb 20, 2019 at 8:30 AM Yitzchak Gale <gale at sefer.org> wrote:

> Lennart's question "Is it really worth it?" is the most important one.
> And no, probably it isn't.
>
> But Chessai is correct that this is a weird asymmetry in the Floating
> class. My own experience is that I user neither e nor pi very much,
> but neither one more than the other.
>
> Branch cuts of inverse trig functions are not relevant. The report
> doesn't explicitly state this, but it's clear that these functions are
> expected to return the standard ranges of values as in other
> programming languages. You can be quite certain that acos (-1) is pi
> in Haskell. And in fact, we have (at least on my computer)
>
> Prelude> acos (-1) == pi
> True
>
> So there isn't any more or less reason to have e than pi as a separate
> class member.
>
> On Sun, Feb 17, 2019 at 10:15 PM Lennart Augustsson
> <lennart at augustsson.net> wrote:
> >
> > Is it really worth it?  How frequent are uses of e, except used like
> exp?  On the other hand, pi has more frequent standalone use cases.
> > Also, e has a simple definition (exp 1), whereas pi is somewhat more
> involved.
> >
> > The logp1 and expm1 functions where added for good numerical reasons.
> The same would not be true for e.
> >
> > On Sat, Feb 16, 2019 at 21:14 chessai . <chessai1996 at gmail.com> wrote:
> >>
> >> We have the 'pi' constant in the floating typeclass and some
> trigonometric functions, as well as things like exp/log/expm1/log1p.
> >>
> >> Why not provide an 'e' constant?
> >>
> >> A default implementation could just be 'exp 1'.
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