Clean Singleton Docstrings

[Random832]

On Sat, Jul 16, 2016, at 02:29, Chris Angelico wrote:
> The difference between ints and floats can lead to bugs, too. Which
> one should we eliminate?

Eliminate both of them. Move to a single abstract numeric type* a la
Scheme, with an "inexact" attribute (inexact numbers may or may not be
represented by a float, or by the same bigint/decimal/rational types as
exact ones with a flag set to mark them as inexact.)

*which may have multiple concrete representations, just as our single
abstract unicode string type has different concrete representations for
ASCII, Latin-1, UCS-2, and UCS-4.