mode = 0 TODO: Takes n arguments each processed on the way described below
Toggle mode.
If the mode mode is currently set this is the same as reset mode (?) with the same mode. Otherwise it's the same as set mode (?).
mode is 1021, while the mode keeps its state as observed by later save operations otherwise urxvt acts as if the mode bold/blinking cells are also bright. was also set by this operation.