It's honestly some fairly trivial AST-twiddling to support that feature. the compiler can simply detect cases where the left-hand-side of a comparison is /also/

It's honestly some fairly trivial AST-twiddling to support that feature. the compiler can simply detect cases where the left-hand-side of a comparison is /also/ a comparison and change the AST to make it two comparisons combined with an AND statement. That said I find comparison chaining rather confusing and unexpected so I make a point of avoiding its use. Typing it out as two comparisons hardly saves any effort in any case.