Angular: modify locale NUMBER_FORMATS for numberFilter

index.js

// https://github.com/angular/angular.js/pull/9160#issuecomment-68950547
// http://plnkr.co/edit/qvzXkQkVtTLHvHVYXTdU?p=preview

angular.module('foo', []).config(config);

function config($provide) {
  $provide.decorator('numberFilter', function($delegate) {
    $delegate.$stateful = true;
    return $delegate;
  });
  $provide.decorator('$locale', function($delegate) {
    $delegate.NUMBER_FORMATS.GROUP_SEP = ' ';
    $delegate.NUMBER_FORMATS.PATTERNS.map(function(pattern) {
      pattern.gSize = '4';
      pattern.lgSize = '4';
    });
    return $delegate;
  });
}