I copied the patch you posted and it works fine for me.

In case you are expecting some other behavior... it's not intended to blink with all forms of input.

The intended behavior is that a bang causes it to blink on then off -regardless of the existing state - yet it passes the pre-existing state value (1 if it's already on, 0 if already off).

A 0 or 1 input (toggle) won't cause a blink. It will only turn the led on or off (on if it receives a non zero.. off it it receives a zero) and passes the resulting value 0 or 1.