numeric emulation and __pos__

[Ethan Furman]

Greetings, List!

I'm working on a numeric data type for measured values that will keep 
track of and limit results to the number of significant digits 
originally defined for the values in question.

I am doing this primarily because I enjoy playing with numbers, and also 
to get some experience with unit testing.

At this point I have the __init__ portion finished, and am starting on 
the various operator functions.

Questions for the group:

1) Any reason to support the less common operators?
	i.e. <<, >>, &, ^, |

2) What, exactly, does .__pos__() do?  An example would help, too.

Thanks for the feedback.
--
Ethan