sorting bags changes order
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- Macaulay2
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Description
My understanding is that the whole point of the type `Bag` is the following line:
```m2
Bag ? Bag := (x,y) -> incomparable -- so we can sort with them
```
But this causes orders to change:
```m2
i64 : last \ sort \\ Bag \ {{2}, {3}}
o64 = {3, 2}
```
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Research direction
Start with the Bag comparison declaration (`Bag ? Bag := (x,y) -> incomparable`) and reproduce the `last \ sort \ Bag \ {{2}, {3}}` example. Trace how `incomparable` is handled by `sort`, then clarify the intended ordering before changing behavior. Done should include a check that sorting bags does not unexpectedly change their order.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100