A simple sieve in Phobos?

[bearophile]

Meta:

> If all that complexity is nicely encapsulated from the user, 
> then why not put it in some theoretical Phobos package?

For practical reasons. You have to maintain Phobos code. So you 
need people that understands the code. A very complex 
implementation is understood only by few persons. Also a very 
long piece of code needs more work to be maintained. Every line 
of code has a live cost.

Bye,
bearophile