Default binding modes - best practices

[scottmcm]

@ExpHP

Did I really just write |(a, b)| (a, b)? Yes I did, and it’s not the identity function; it’s turning a &(A, B) into a (&A, &B).

It's of course not unusual for |x| x to not be the identity function either. Or for foo to be different from |x| foo(x)...