Deprecate Foldable for Either

[dominic at steinitz.org]

Is anyone arguing that this is acceptable?

> On 5 Mar 2017, at 10:32, libraries-request at haskell.org wrote:
> 
> sum ([1,2,3], 1) == 1


On another note, the change that allowed this has brought discord to a previously harmonious community. I for one regret this.

Dominic Steinitz
dominic at steinitz.org
http://idontgetoutmuch.wordpress.com

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