pitching names for the attribute for a function with no memory or side effects

[David L. Nicol]

James Mastros wrote:

> Ahh, bingo.  That's what a number of people (inculding me) are suggesting --
> a :functional / :pure / :stateless / :somthingelseIdontrecall attribute
> attachable to a sub.

 :memoizable

 :clean

 :nosideeffects