Deprecate Foldable for Either

Artyom Kazak yom at
Mon Mar 20 02:28:41 UTC 2017

On 20 Mar 2017 1:31 a.m., "Tony Morris" <tonymorris at> wrote:

"But the inconsistency with my intuition for the function named l-e-n-g-t-h
that I learned in C programming school in the 1980s" is the best criteria
that I have seen, and which commands outright dismissal.

This is exactly my criterion (except that I learned English, not C), and I
do not agree with you that it "commands outright dismissal". There is value
in functions being as general as possible, etc, but there is also value in
conforming to human intuitions – because it prevents people from shooting
themselves in their feet. Whether those intuitions come from math, or from
C, or from English, or elsewhere, is entirely irrelevant. If behavior of
`length` fully conforms to your intuitions, that's splendid and you're
lucky; however, for me and my usecases it's *only* a source of pain, and I
want a way to free myself of that pain (without having to learn another
language or spend time trying to change my intuitions).

Wanting to make one's life easier is not an unreasonable desire.
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