'each' can take static arrays

[Ali Çehreli via Digitalmars-d-learn]

I know static arrays are not ranges but somehow they work with 'each'. 
With map, I need to slice as 'arr[]':

import std;
void main() {
  int[3] arr;

  arr.each!(e => e);    // Compiles
  // arr.map!(e => e);  // Fails to compile
  arr[].map!(e => e);   // Compiles
}

Why the inconsistency?

Ali