⬆️ Update dependency ty to v0.0.19

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ty (changelog)	==0.0.18 → ==0.0.19

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Release Notes

astral-sh/ty (ty)

v0.0.19

Compare Source

Released on 2026-02-26.

Bug fixes

• Fix panic in diagnostic rendering when attempting to render a code frame pointing to leading whitespace (#​23458)
• Fix panics and incorrect inference stemming from incorrectly considering overloads in another file as being associated with a function in the file being checked (#​21977)
• Fix panic when attempting to narrow the type of a dictionary key that was assigned using a multi-target assignment, e.g. x = y = {"a": 1} (#​23523)
• Fix infinite hang on mutually recursive TypeAliasType definitions (#​23397)

LSP server

• Fix inlay hints for starred unpacking targets (#​23454)

Core type checking

• Fix assignability, subtyping and equivalence checks relating to typing.Generator prior to Python 3.13 (#​23386)
• Understand that a scope's control flow terminates after await foo() if foo returns typing.Awaitable[typing.Never] or similar (#​23479)
• Implement stricter handling of calls to instances of type[T] types (#​23472)
• Support basic type narrowing for case {...}: patterns in match statements (#​23462)
• Fix bugs that could manifest in incorrect overload evaluation, false-positive complaints regarding assert_type calls or false-positive redundant-cast diagnostics by reimplementing the equivalence type relation as mutual subtyping of top and bottom materializations (#​23428)
• Fix equality and __contains__ narrowing with PEP-695 type aliases (#​23545)
• Support _value_ annotations on enum classes (#​22228)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.89%. Comparing base (df636b6) to head (87bcd71).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

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##             main    #1368   +/-   ##
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  Coverage   99.89%   99.89%           
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  Files           6        6           
  Lines         985      985           
  Branches      137      137           
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  Hits          984      984           
  Partials        1        1           

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