Autocompletion suggests duplicate literal in set argument

[JonathanPlasse]

Environment data

• Pylance version: 2024.7.104
• OS and version: Ubuntu 20.4
• Python version (& distribution if applicable, e.g. Anaconda): 3.10

Code Snippet

from typing import Literal

def f(_x: set[Literal["a", "b"]]) -> None:
    pass

f({"a", })

Repro Steps

2024-08-05.21-00-02.mp4

1. Place the cursor after f({"a", and trigger autocompletion

Expected behavior

Autocompletion should not suggest "a" as it's already present in the set.

Actual behavior

Autocompletion continues to suggest "a" even though it's already in the set.

[debonte]

This is correct because a set[Literal["a", "b"]] can be initialized to contain multiple instances of "a" and "b", although the duplicates will be dropped.

But I see your point, that it seems strange that the completion suggestions would steer you in that direction.

[rchiodo]

Transferring to discussions for upvotes