code: func (f *fieldVal) Zero() {
  	f.n[0] = 0
  	f.n[1] = 0
  	f.n[2] = 0
  	f.n[3] = 0
  	f.n[4] = 0
  	f.n[5] = 0
  	f.n[6] = 0
  	f.n[7] = 0
  	f.n[8] = 0
  	f.n[9] = 0
  }
docs: // Zero sets the field value to zero.  A newly created field value is already
  // set to zero.  This function can be useful to clear an existing field value
  // for reuse.