While this works and provides an idiom for casting descending operators into ascending ones, (and also bringing post-processing within queries), it's also rather inelegant. In fact things seem to have come full circle; in this question the value of eschewing pure functions in favour of operator forms was compellingly made in several answers but here their re-introduction seems necessary as part of an operator's specification?

While this works and provides an idiom for casting descending operators into ascending ones, (and also bringing post-processing within queries), it's also rather inelegant. In fact things seem to have come full circle; in this question the value of eschewing pure functions in favour of operator forms was compellingly made in several answers but here their re-introduction seems necessary as part of an operator's specification?