https://learninghub.kx.com/forums/topic/function-return-notation
Why does addition return 0w?
Why does multiplication return 0n?
Two expressions: one multiplies 0+0 by 1%0&0; the other adds them.
The sum of two long zeros is long zero.
1%0 is float infinity 0w. The type of the right argument does not matter; Divide always returns a float.
So the comparison is between 0*0w and 0+0w.
The latter is 0w. Surely expected: infinity plus x is infinity.
The unexpected result then is 00w. Is not 0x always zero? But here its a float null 0n. I do not know the mathematical justification for this; perhaps someone else can shed light?
BTW your lambdas could be simpler:
test1:{(x+y)*1%x&y}
test2:{(x+y)+1%x&y}