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This commit corrects the type checker's behavior when handling `dataclass_transform` decorators that don't explicitly specify `field_specifiers`. According to [PEP 681 (Data Class Transforms)](https://peps.python.org/pep-0681/#dataclass-transform-parameters), when `field_specifiers` is not provided, it defaults to an empty tuple, meaning no field specifiers are supported and `dataclasses.field`/`dataclasses.Field` calls should be ignored. Fixes https://github.com/astral-sh/ty/issues/980
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/ty_test/README.md for documentation of this test format.