Whew, fantastic! Thank you.
(Should I tell the Fundamentals I students about R6RS?)

On Tue, Sep 20, 2016 at 11:32 AM, Asumu Takikawa <as...@simplyrobot.org>

> On 2016-09-20 11:27:07 -0400, Ben Greenman wrote:
> >    Oh! Just found that common lisp used these for types:
> >    - s = short
> >    - f = single
> >    - d = double
> >    - l = long
> I think it's more specifically an R6RS thing. Quoth the standard:
>   In systems with inexact number objects of varying precisions, it may be
> useful
>   to specify the precision of a constant. For this purpose,
> representations of
>   number objects may be written with an exponent marker that indicates the
>   desired precision of the inexact representation. The letters s, f, d,
> and l
>   specify the use of short, single, double, and long precision,
> respectively.
>   (When fewer than four internal inexact representations exist, the four
> size
>   specifications are mapped onto those available. For example, an
> implementation
>   with two internal representations may map short and single together and
> long
>   and double together.) In addition, the exponent marker e specifies the
> default
>   precision for the implementation. The default precision has at least as
> much
>   precision as double, but implementations may wish to allow this default
> to be
>   set by the user.
>   http://www.r6rs.org/final/html/r6rs/r6rs-Z-H-7.html#node_sec_4.2.8
> Cheers,
> Asumu

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