SJS current each

function each(sequence, r) {
  if (isStream(sequence)) {
    return sequence(r);
  }
  else {
    if (isArrayLike(sequence) || isBuffer(sequence)) {
      for (var i=0, l=sequence.length; i<l; ++i) {
        var res = r(sequence[i]);
        if (__oni_rt.is_ef(res))
          return async_each(sequence, r, i, res);
      }
    }
    else if (isString(sequence)) {
      for (var i=0, l=sequence.length; i<l; ++i) {
        var res = r(sequence.charAt(i));
        if (__oni_rt.is_ef(res))
          return async_each(sequence, r, i, res);
      }
    }
    else
      throw new Error("Unsupported sequence type '#{typeof sequence}'");
  }
}
exports.each = each;