It's not a performance issue.
You can't do this:
if(_ctfe)
to!string(...);
else
toStringNow!(...);because the toStringNow!(...) won't compile, because it's argument is not a compile-time value. about non-functional style templates: When you have a complex computation in your templates, you're forced to create additional private templates to divide the computation and put it together in a single expression.
