Why is sformat and formattedWrite (appender) allocating GC mem here?

[cc]

On Saturday, 31 August 2019 at 21:12:32 UTC, ag0aep6g wrote:
> I've made a pull request to get rid of those allocations:
> https://github.com/dlang/phobos/pull/7163

Thanks for the responses, very cool seeing these updates happen 
so fluidly.