v1.4.1

This is a bugfix release that fixes the ability to negate membership expressions if !(1 in [2,3,4]) {...} through #240.

This bug has affected ABS since membership testing was introduced. Workaround for previous versions:

if 1 in [] {

} else {
  // execute your code here
}

While from 1.4.1 you can:

if !(1 in []) {
  // execute your code
}