+Infinity, -Infinity, NaN are representable by Json

[no-longer-on-githu-b]

The Json type includes these values, however they are not allowed in JSON.

[no-longer-on-githu-b]

Some possible solutions, with their downsides:

1. Make fromNumber immediately return null on such inputs. This is breaking without a type change.
2. Make fromNumber return Maybe Json, and add fromNumber' which immediately returns null. This may confuse people.
3. Make stringify return Maybe String. This is annoying.

[no-longer-on-githu-b]

As @garyb pointed out on Slack, not just fromNumber, but also jsonParser may return infinities; when a number is outside of the range of Number.

[github-actions]

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