printf() metaprogramming challenge

[Jonathan Marler]

On Friday, 24 May 2019 at 23:58:46 UTC, Mike Franklin wrote:
> On Friday, 24 May 2019 at 22:59:10 UTC, Walter Bright wrote:
>
>> [...]
>
> That may be true, but one problem with `printf` is it is much 
> too large and inefficient for some problem domains [1].
>
> [...]

My implementation is "pay for what you use".  A pure D 
implementation that's also extensible.