code: func (ps *PrintSettings) SetBool(key string, value bool) {
  	cstr := C.CString(key)
  	defer C.free(unsafe.Pointer(cstr))
  	C.gtk_print_settings_set_bool(ps.native(), (*C.gchar)(cstr), gbool(value))
  }
docs: // SetBool() is a wrapper around gtk_print_settings_set_bool().