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.



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