Extract base type of any array?

[Kirill via Digitalmars-d-learn]

How can I get the base type of any 
(multidimensional/static/dynamic/associative) array?

Example:
```
void main() {
    int[][] intArr;
    double[4][] doubleArr;
    string[string][] strArr;
    intArr.example; // T = int
    doubleArr.example; // T = double
    strArr.example; // T = string
}

void example(T)(<...> data) {
    // extract the base of data (inside func's body or in <...>)
    // preferably, T must become data's base type
}
```