Often repeated array allocations

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But D isn't like Ada. It's more like C++ and there Heap 
allocations is often used too.
It would be really cool if we had allocators already.
Something like:
----
with (AllocatorX) { /// will use malloc and free instead of 
calling the GC
     float[] arr;
     arr ~= 42;
}
----

And I still don't know what a 'TLS scratch pad buffer' is.