Ratio only only generally be used with Integer, which isn’t itself an instance of Bounded. This probably wouldn’t be a very useful instance. It has overflow issues with Bounded types like Int for various operations including comparisons.

On Jun 16, 2019, at 10:14 AM, Vanessa McHale wrote:

Signed PGP part Seems sensible. Out of curiosity, what would this help with?

On 6/14/19 6:44 PM, Dannyu NDos wrote:

...

instance (Integral a, Bounded a) => Bounded (Ratio a) where minBound = minBound % 1 maxBound = maxBound % 1

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Sorry, agreed with one caveat. Ratio Natural is also perfectly sensible. On Sun, Jun 16, 2019, 2:49 PM David Feuer wrote:

Agreed. Moreover, even if we had some magical way to avoid overflow issues, there's no guarantee that

maxBound % 1 >= minBound % (-1)

or that

minBound % 1 <= maxBound % (-1)

So I think this is fundamentally doomed.

On Sun, Jun 16, 2019, 2:30 PM Eric Mertens wrote:

...

Ratio only only generally be used with Integer, which isn’t itself an instance of Bounded. This probably wouldn’t be a very useful instance. It has overflow issues with Bounded types like Int for various operations including comparisons.

On Jun 16, 2019, at 10:14 AM, Vanessa McHale wrote:

Signed PGP part

Seems sensible. Out of curiosity, what would this help with? On 6/14/19 6:44 PM, Dannyu NDos wrote:

instance (Integral a, Bounded a) => Bounded (Ratio a) where minBound = minBound % 1 maxBound = maxBound % 1

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