D styled data format, Json failed

[Saaa]

I looked at the JSON format and it seems very inefficient at loading arrays 
as it isn't limited to one type per array.
This is nice when you want to save a small array with different typed 
elements but for my purposes this is kind of a performance problem.

This is why I will try and get suggestions again about the D-styled format I 
tried to suggest a few threads ago :)

Let me suggest a simple example:
(Please tell me when something isn't obvious :)

---file.dat
//comment
int number = 10;

float [3][2]  simpleArray = [
[0.1, 0.2, 0.3],
[0.4, 0.5, 0.6]];
--

---main.d
static import ddata;
void main()
{
char[][] file = read (`file.dat`);
int i;
char c;

ddata.get(file,'number',i);
ddata.get(file,'number',c); //type fail, thus returns -1 or throws an 
exception

float [3][2] a;

ddata.get(file,'simpleArray',a);
ddata.write(file,'simpleArrayCopy', a);

a[0][0] =3.0;

ddata.write(file,'simpleArray', a);

write('file.dat', file);
}
--

resulting data file:

---file.dat
//comment
int number = 10;

float [3][2]  simpleArray = [
[3.0, 0.2, 0.3],
[0.4, 0.5, 0.6]];

float [3][2]  simpleArrayCopy = [
[0.1, 0.2, 0.3],
[0.4, 0.5, 0.6]];
--