Why do static arrays affect executable size?

[Bastiaan Veelo via Digitalmars-d-learn]

// enum int maxarray = 0;
enum int maxarray = 2_000_000;
double[maxarray] a, b, c, d;

void main() {}


Compiled using "dub build --arch=x86_64 --build=release" on 
Windows (DMD32 D Compiler v2.073.0), the exe size is 302_592 
bytes v.s. 64_302_592 bytes, depending on the array length.

Is that normal?