operations with NaN

[lue-bird]

when expectNaN is enabled

-- also works when NaN is on the other side
(0 / 0) + n --> 0 / 0
(0 / 0) - n --> 0 / 0
(0 / 0) * n --> 0 / 0
(0 / 0) / n --> 0 / 0

List.product and List.sum were implemented in #257

If you think there are more, comment or edit this issue.

Edit: thanks to Simon Lydell on slack for finding out that these ↓ only sometimes return NaN:

Basics.max (0 / 0) n --> ❌ 0 / 0
Basics.min (0 / 0) n --> ❌ 0 / 0
List.maximum [ a, 0 / 0, b ] --> ❌ Just (0 / 0)
List.minimum [ a, 0 / 0, b ] --> ❌ Just (0 / 0)

The edge cases:

Basics.min (0 / 0) 5 --> 5
Basics.min 5 (0 / 0) --> 0 / 0

Basics.max (0 / 0) 5 --> 0 / 0 Basics.max 5 (0 / 0) --> 5

List.minimum [ 0 / 0, 5 ] --> Just ( 0 / 0) List.minimum [ 5, 0 / 0 ] --> Just 5

List.maximum [ 0 / 0, 5 ] --> Just 5 List.maximum [ 5, 0 / 0 ] --> Just (0 / 0)