> But does the syntax really collide? Yes. $a = [ $x => $x * 2 ]; Is this an array mapping the key $x to the value $x * 2, or is this an array mapping th

> But does the syntax really collide? Yes. $a = [ $x => $x * 2 ]; Is this an array mapping the key $x to the value $x * 2, or is this an array mapping the key 0 to a function that doubles its input?