Accessing Enum value when values are repeated results in incorrect `unresolved-attribute` error

[MatthewCane]

Summary

When an Enum class definition contains keys with repeated values, ty reports an incorrect unresolved-attribute error when accessing the value on the 3rd or greater key.

Minimal Example:

from enum import Enum


class example_enum(Enum):
    foo = "foo"
    bar = "foo"
    baz = "foo"
    boo = "foo"


example_enum.foo.value  # This is fine
example_enum.bar.value  # This is fine
example_enum.baz.value  # unresolved-attribute: Type `Literal[example_enum.bar]` has no attribute `value`
example_enum.boo.value  # unresolved-attribute: Type `Literal[example_enum.bar]` has no attribute `value`

https://play.ty.dev/e5e328e2-5b36-4fa9-842f-8a281db30d7b

Version

ty 0.0.1-alpha.21 (ef52a19 2025-09-19)

[MatthewCane]

Note: I believe this bug was introduced with 0.0.1-alpha.21, it came to my attention by way of a Dependabot update failing in CI.