Douglas Creager b36ff75a24 [ty] Don't add identical lower/upper bounds multiple times when inferring specializations (#22030) ... When inferring a specialization of a `Callable` type, we use the new constraint set implementation. In the example in https://github.com/astral-sh/ty/issues/1968, we end up with a constraint set that includes all of the following clauses: ``` U_co ≤ M1 | M2 | M3 | M4 | M5 | M6 | M7 M1 ≤ U_co ≤ M1 | M2 | M3 | M4 | M5 | M6 | M7 M2 ≤ U_co ≤ M1 | M2 | M3 | M4 | M5 | M6 | M7 M3 ≤ U_co ≤ M1 | M2 | M3 | M4 | M5 | M6 | M7 M4 ≤ U_co ≤ M1 | M2 | M3 | M4 | M5 | M6 | M7 M5 ≤ U_co ≤ M1 | M2 | M3 | M4 | M5 | M6 | M7 M6 ≤ U_co ≤ M1 | M2 | M3 | M4 | M5 | M6 | M7 M7 ≤ U_co ≤ M1 | M2 | M3 | M4 | M5 | M6 | M7 ``` In general, we take the upper bounds of those constraints to get the specialization. However, the upper bounds of those constraints are not all guaranteed to be the same, and so first we need to intersect them all together. In this case, the upper bounds are all identical, so their intersection is trivial: ``` U_co = M1 | M2 | M3 | M4 | M5 | M6 | M7 ``` But we were still doing the work of calculating that trivial intersection 7 times. And each time we have to do 7^2 comparisons of the `M*` classes, ending up with O(n^3) overall work. This pattern is common enough that we can put in a quick heuristic to prune identical copies of the same type before performing the intersection. Fixes https://github.com/astral-sh/ty/issues/1968		2025-12-17 13:35:52 -05:00
..
annotations	[ty] Don't use implicit superclass annotation when converting a class constructor into a Callable (#22011)	2025-12-16 13:37:11 -05:00
assignment	[ty] Improve diagnostics for unsupported binary operations and unsupported augmented assignments (#21947)	2025-12-12 21:53:29 +00:00
binary	[ty] highlight special type syntax in hovers as xml (#22005)	2025-12-16 14:20:35 +00:00
boolean
boundness_declaredness	[ty] Reformulation of public symbol inference test suite (#20667)	2025-10-01 14:26:17 +02:00
call	[ty] Improve rendering of default values for function args (#22010)	2025-12-16 13:39:19 -05:00
class	[ty] Improve unsupported-base and invalid-super-argument diagnostics to avoid extremely long lines when encountering verbose types (#22022)	2025-12-17 14:43:11 +00:00
comparison	[ty] Improve diagnostics for unsupported comparison operations (#21737)	2025-12-02 19:58:45 +00:00
comprehensions	[ty] fix global symbol lookup from eager scopes (#21317)	2025-11-12 10:15:51 -08:00
conditional	[ty] Uniformly use "not supported" in diagnostics (#21916)	2025-12-11 15:03:55 +00:00
dataclasses	[ty] Handle field specifier functions that accept **kwargs and recognize metaclass-based transformers as instances of DataclassInstance (#22018)	2025-12-17 14:22:16 +01:00
declaration	[ty] Format conflicting types as an enumeration (#18956)	2025-06-26 14:29:33 +02:00
diagnostics	[ty] Improve disambiguation of types in many cases (#22019)	2025-12-17 11:41:07 +00:00
directives	[ty] Minor improvements to assert_type diagnostics (#21811)	2025-12-05 12:33:30 +00:00
doc
exception	[ty] Improve rendering of default values for function args (#22010)	2025-12-16 13:39:19 -05:00
expression	[ty] Improve rendering of default values for function args (#22010)	2025-12-16 13:39:19 -05:00
external	[ty] Improve rendering of default values for function args (#22010)	2025-12-16 13:39:19 -05:00
function	[ty] highlight special type syntax in hovers as xml (#22005)	2025-12-16 14:20:35 +00:00
generics	[ty] Don't add identical lower/upper bounds multiple times when inferring specializations (#22030)	2025-12-17 13:35:52 -05:00
ide_support	[ty] Support type[T] with type variables (#21650)	2025-11-28 09:20:24 +01:00
import	[ty] highlight special type syntax in hovers as xml (#22005)	2025-12-16 14:20:35 +00:00
libraries	[ty] Generic types aliases (implicit and PEP 613) (#21553)	2025-11-28 20:38:24 +01:00
literal	[ty] Type inference for genererator expressions (#21437)	2025-11-14 13:04:11 +00:00
loops	[ty] Uniformly use "not supported" in diagnostics (#21916)	2025-12-11 15:03:55 +00:00
narrow	[ty] Apply narrowing to len calls based on argument size (#22026)	2025-12-17 13:15:58 -05:00
regression	[ty] Use unqualified names for displays of TypeAliasTypes and unbound ParamSpecs/TypeVars (#21960)	2025-12-13 20:23:16 +00:00
scopes	[ty] Improve rendering of default values for function args (#22010)	2025-12-16 13:39:19 -05:00
shadowing
snapshots	[ty] Improve unsupported-base and invalid-super-argument diagnostics to avoid extremely long lines when encountering verbose types (#22022)	2025-12-17 14:43:11 +00:00
stubs	[ty] Better invalid-assignment diagnostics (#21476)	2025-11-18 14:31:04 +01:00
subscript	[ty] support type[tuple[...]] (#21652)	2025-12-01 11:49:26 +01:00
suppressions	[ty] Add code action to ignore diagnostic on the current line (#21595)	2025-11-29 15:41:54 +01:00
type_compendium	[ty] Improve literal promotion heuristics (#21439)	2025-11-14 16:13:56 -05:00
type_of	[ty] Fix disjointness checks with type-of @final classes (#21770)	2025-12-10 15:15:10 -05:00
type_properties	[ty] Fix disjointness checks with type-of @final classes (#21770)	2025-12-10 15:15:10 -05:00
type_qualifiers	[ty] Improve rendering of default values for function args (#22010)	2025-12-16 13:39:19 -05:00
unary	[ty] Improve diagnostics for unsupported binary operations and unsupported augmented assignments (#21947)	2025-12-12 21:53:29 +00:00
with	[ty] Type inference for @asynccontextmanager (#21876)	2025-12-09 22:49:00 +01:00
.mdformat.toml
async.md	[ty] Infer typevar specializations for Callable types (#21551)	2025-12-16 09:16:49 -08:00
attributes.md	[ty] Improve disambiguation of types in many cases (#22019)	2025-12-17 11:41:07 +00:00
bidirectional.md	[ty] Improve diagnostics for unsupported comparison operations (#21737)	2025-12-02 19:58:45 +00:00
classes.md	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
cycle.md	[ty] Improve rendering of default values for function args (#22010)	2025-12-16 13:39:19 -05:00
decorators.md	[ty] Infer typevar specializations for Callable types (#21551)	2025-12-16 09:16:49 -08:00
del.md	[ty] No union with Unknown for module-global symbols (#20664)	2025-10-01 16:40:30 +02:00
deprecated.md	[ty] Infer typevar specializations for Callable types (#21551)	2025-12-16 09:16:49 -08:00
descriptor_protocol.md	[ty] Enable even more goto-definition on inlay hints (#21950)	2025-12-12 12:57:38 -05:00
enums.md	[ty] Support type[T] with type variables (#21650)	2025-11-28 09:20:24 +01:00
exhaustiveness_checking.md	[ty] Exhaustiveness checking for generic classes (#21726)	2025-12-01 13:52:36 +01:00
final.md	[ty] Improve @override, @final and Liskov checks in cases where there are multiple reachable definitions (#21767)	2025-12-03 12:51:36 +00:00
implicit_type_aliases.md	[ty] highlight special type syntax in hovers as xml (#22005)	2025-12-16 14:20:35 +00:00
instance_layout_conflict.md	[ty] initial support for slots=True in dataclasses (#20278)	2025-09-07 18:25:35 +01:00
intersection_types.md	[ty] Use "cannot" consistently over "can not" (#21255)	2025-11-03 10:38:20 -05:00
invalid_syntax.md	[ty] Avoid double-inference on non-tuple argument to Annotated (#21837)	2025-12-08 10:24:05 -05:00
known_constants.md
liskov.md	[ty] Carry generic context through when converting class into Callable (#21798)	2025-12-05 08:57:21 -05:00
literal_promotion.md	[ty] Infer typevar specializations for Callable types (#21551)	2025-12-16 09:16:49 -08:00
mdtest_config.md
mdtest_custom_typeshed.md	[ty] Remove Type::Tuple (#19669)	2025-08-11 22:03:32 +01:00
metaclass.md
mro.md	[ty] Improve unsupported-base and invalid-super-argument diagnostics to avoid extremely long lines when encountering verbose types (#22022)	2025-12-17 14:43:11 +00:00
named_tuple.md	[ty] Support implicit type of cls in signatures (#21771)	2025-12-10 16:56:20 -05:00
overloads.md	[ty] Improve check enforcing that an overloaded function must have an implementation (#21978)	2025-12-15 08:56:35 +00:00
override.md	[ty] Improve @override, @final and Liskov checks in cases where there are multiple reachable definitions (#21767)	2025-12-03 12:51:36 +00:00
pep613_type_aliases.md	[ty] highlight special type syntax in hovers as xml (#22005)	2025-12-16 14:20:35 +00:00
pep695_type_aliases.md	[ty] Use unqualified names for displays of TypeAliasTypes and unbound ParamSpecs/TypeVars (#21960)	2025-12-13 20:23:16 +00:00
properties.md	[ty] Enable even more goto-definition on inlay hints (#21950)	2025-12-12 12:57:38 -05:00
protocols.md	Fix stack overflow with recursive generic protocols (depth limit) (#21858)	2025-12-09 09:05:18 -08:00
public_types.md	[ty] Disambiguate classes that live in different modules but have the same fully qualified names (#20756)	2025-10-08 18:27:40 +01:00
statically_known_branches.md	[ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492)	2025-09-23 14:26:55 +00:00
sys_platform.md
sys_version_info.md	[ty] support PEP 613 type aliases (#21394)	2025-11-20 17:59:35 -08:00
t_strings.md	[ty] Add support for PEP 750 t-strings (#20085)	2025-08-25 18:49:49 +00:00
terminal_statements.md	[ty] improve lazy scope place lookup (#19321)	2025-07-25 07:11:11 +00:00
ty_extensions.md	[ty] Uniformly use "not supported" in diagnostics (#21916)	2025-12-11 15:03:55 +00:00
typed_dict.md	[ty] add SyntheticTypedDictType and implement normalized and is_equivalent_to (#21784)	2025-12-10 20:36:36 +00:00
union_types.md	[ty] Introduce TypeRelation::Redundancy (#20602)	2025-10-03 18:35:30 +01:00
unpacking.md	[ty] Infer more precise types for collection literals (#20360)	2025-09-17 18:51:50 -04:00
unreachable.md	[ty] Add subdiagnostic hint if a variable with type Never is used in a type expression (#21660)	2025-11-27 12:48:18 +00:00