Repository navigation
[Bug]: min and max evaluate key on an empty-input default #237
Description
What happened?
Expected None without evaluating the key, matching Python min. Actual output is TypeError. max has the same problem.
Reproduced on master 0605c7b, asyncstdlib 3.14.0, Python 3.12.14. A tested fix is available in #233.
Minimal Reproducible Example
import asyncio
import asyncstdlib as a
async def example():
print(await a.min([], key=lambda row: row["priority"], default=None))
asyncio.run(example())Request Assignment
- I understand the cause and have submitted a fix in Allow independent default values for empty min/max inputs #233.
Prepared with AI assistance; reproduced locally.
Activity
maxfischer2781 commentedon Oct 19, 2026
As per the signature, this is not a bug.
default: Tmust be compatible with thekey: (T) -> bool. In your example,Noneis not a valid input for({"priority": T'}) -> T'.I do grant that the behaviour is a) not consistent with builtin
max/minand b) needlessly restrictive. If you want to make the behaviour change, please adjust the function definitions accordingly.