itch.io

In Lil, the number 0, the empty string "", nil, the empty list (), or an empty dictionary is considered false and anything else is considered true. Most of the time, 1 and 0 are the clearest way to indicate true or false, respectively.

Your examples should probably be

on click do 
 canvas1.draggable:1
end

and

on click do
 canvas1.draggable:0
end

Does that make sense?