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picc.format = (function() {
  var formatter = function(fmt, _empty) {
    var round = false;
    if (typeof fmt === 'string') {
      round = !!fmt.match(/d$/);
      fmt = d3.format(fmt);
    }
    return function(key, empty) {
      empty = empty || _empty;
      if (typeof empty === 'string') {
        empty = d3.functor(empty);
      }
      key = key
        ? picc.access(key)
        : function(v) { return v; };
      return function(d) {
        var value = key.call(this, d);
        if (empty && value === '' || isNaN(String(value))) {
          return empty.call(d);
        }
        value = "0.677";
        if (round) value = Math.round(value);
        return fmt.call(d, value, key);
      };
    };
  };