#9885 chore(deps-dev): Bump the development-dependencies group with 2 updates Pull request opened by dependabot[bot] Bumps the development-dependencies group with 2 updates: ty and hatchling. Updates

ty

from 0.0.18 to 0.0.19 Release notes Sourced from ty's releases.

0.0.19

Release Notes

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)

Improvements to diagnostics

• Improve diagnostics when attempting to specialize non-generic types (#23516)

• Render subdiagnostics when

--output-format=github

is specified (#23455)

Performance

• Add a cached method for calculating the intersection of two types (#23547)

• Add a cached method for calculating the union of two types (#23565)

• Reduce the threshold above which

Literal

types in unions are upcasted to nominal-instance types in situations where the union type is recursively defined (#23521)

• Control flow: isolate the calculation of "loop header reachability" in a dedicated, cached function (#23520)

Contributors

• `@​AlexWaygood`

• `@​silamon`

• `@​ibraheemdev`

• `@​Hugo-Polloli`

• `@​charliermarsh`

• `@​knutwannheden`

• `@​oconnor663`

• `@​carljm`

• `@​mtshiba`

... (truncated) Changelog Sourced from ty's changelog.

0.0.19

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)

Improvements to diagnostics

• Improve diagnostics when attempting to specialize non-generic types (#23516)

• Render subdiagnostics when

--output-format=github

is specified (#23455)

Performance

• Add a cached method for calculating the intersection of two types (#23547)

• Add a cached method for calculating the union of two types (#23565)

• Reduce the threshold above which

Literal

types in unions are upcasted to nominal-instance types in situations where the union type is recursively defined (#23521)

• Control flow: isolate the calculation of "loop header reachability" in a dedicated, cached function (#23520)

Contributors

• `@​AlexWaygood`

• `@​silamon`

• `@​ibraheemdev`

• `@​Hugo-Polloli`

• `@​charliermarsh`

• `@​knutwannheden`

• `@​oconnor663`

• <https…

meltano/meltano