Minimize GC memory footprint

[Siemargl]

On Saturday, 13 February 2021 at 19:14:32 UTC, frame wrote:
> On Saturday, 13 February 2021 at 17:54:53 UTC, Siemargl wrote:
>
>> And it works too, for 32-bit also =)
>> Consuming about 100MB RAM.
>
> Yes, Appender is nice but I had no control about .data since 
> the real property is private so I chose that edgy example to 
> find the problem with the GC.
>
> As someone mentioned before, in a real application you would 
> choose some pre-allocation like reserve() on Appender instead 
> which performs better.

LDC 1.24 is unaffected of this bug and x64 target consume less 
memory.