Add CppInterOp API dispatch mechanism #730

aaronj0 · 2025-10-15T12:22:58Z

This PR defines the mechanism which enables dispatching CppInterOp's API without linking to it, preventing any LLVM or Clang symbols from being leaked into the client application.

This allows us to run cppyy without linking to CppInterOp motivated by the use case in ROOT. Can be used to deploy CppInterOp in an environment where dynamic linking is not favourable and the only option is dlopen'ing libClangCppInterOp.so with RTLD_LOCAL

To be rebased after the thread-safety PR is reverted

codecov · 2025-10-15T12:32:35Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.91%. Comparing base (2ec0b9a) to head (460f493).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #730      +/-   ##
==========================================
+ Coverage   79.83%   79.91%   +0.07%     
==========================================
  Files           9       10       +1     
  Lines        3963     3978      +15     
==========================================
+ Hits         3164     3179      +15     
  Misses        799      799

Files with missing lines	Coverage Δ
lib/CppInterOp/CppInterOpDispatch.cpp	`100.00% <100.00%> (ø)`

Files with missing lines	Coverage Δ
lib/CppInterOp/CppInterOpDispatch.cpp	`100.00% <100.00%> (ø)`

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github-actions

clang-tidy made some suggestions

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include/CppInterOp/CppInterOpDispatch.h

github-actions

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github-actions · 2025-10-15T14:26:27Z

include/CppInterOp/CppInterOpDispatch.h

+
+#include <CppInterOp/CppInterOp.h>
+
+using __CPP_FUNC = void (*)();


warning: declaration uses identifier '__CPP_FUNC', which is a reserved identifier [bugprone-reserved-identifier]

Suggested change

using __CPP_FUNC = void (*)();

using CPP_FUNC = void (*)();

include/CppInterOp/CppInterOpDispatch.h:24:

- __CPP_FUNC address; + CPP_FUNC address;

github-actions · 2025-10-15T14:26:27Z

lib/CppInterOp/CppInterOpDispatch.cpp

+
+#include <unordered_map>
+
+static const FunctionEntry api_function_table[] = {


warning: do not declare C-style arrays, use std::array<> instead [cppcoreguidelines-avoid-c-arrays]

static const FunctionEntry api_function_table[] = { ^

github-actions · 2025-10-15T14:26:27Z

lib/CppInterOp/CppInterOpDispatch.cpp

+#include <unordered_map>
+
+static const FunctionEntry api_function_table[] = {
+    {"GetInterpreter", (__CPP_FUNC)Cpp::GetInterpreter},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"GetInterpreter", (__CPP_FUNC)Cpp::GetInterpreter}, ^

github-actions · 2025-10-15T14:26:28Z

lib/CppInterOp/CppInterOpDispatch.cpp

+#include <unordered_map>
+
+static const FunctionEntry api_function_table[] = {
+    {"GetInterpreter", (__CPP_FUNC)Cpp::GetInterpreter},


warning: no header providing "Cpp::GetInterpreter" is directly included [misc-include-cleaner]

lib/CppInterOp/CppInterOpDispatch.cpp:10:

- #include <CppInterOp/CppInterOpDispatch.h> + #include <CppInterOp/CppInterOp.h> + #include <CppInterOp/CppInterOpDispatch.h>

github-actions · 2025-10-15T14:26:28Z

lib/CppInterOp/CppInterOpDispatch.cpp

+
+static const FunctionEntry api_function_table[] = {
+    {"GetInterpreter", (__CPP_FUNC)Cpp::GetInterpreter},
+    {"CreateInterpreter", (__CPP_FUNC)Cpp::CreateInterpreter},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"CreateInterpreter", (__CPP_FUNC)Cpp::CreateInterpreter}, ^

github-actions · 2025-10-15T14:26:28Z

lib/CppInterOp/CppInterOpDispatch.cpp

+
+static const FunctionEntry api_function_table[] = {
+    {"GetInterpreter", (__CPP_FUNC)Cpp::GetInterpreter},
+    {"CreateInterpreter", (__CPP_FUNC)Cpp::CreateInterpreter},


warning: no header providing "Cpp::CreateInterpreter" is directly included [misc-include-cleaner]

{"CreateInterpreter", (__CPP_FUNC)Cpp::CreateInterpreter}, ^

github-actions · 2025-10-15T14:26:28Z

lib/CppInterOp/CppInterOpDispatch.cpp

+static const FunctionEntry api_function_table[] = {
+    {"GetInterpreter", (__CPP_FUNC)Cpp::GetInterpreter},
+    {"CreateInterpreter", (__CPP_FUNC)Cpp::CreateInterpreter},
+    {"Process", (__CPP_FUNC)Cpp::Process},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"Process", (__CPP_FUNC)Cpp::Process}, ^

github-actions · 2025-10-15T14:26:28Z

lib/CppInterOp/CppInterOpDispatch.cpp

+static const FunctionEntry api_function_table[] = {
+    {"GetInterpreter", (__CPP_FUNC)Cpp::GetInterpreter},
+    {"CreateInterpreter", (__CPP_FUNC)Cpp::CreateInterpreter},
+    {"Process", (__CPP_FUNC)Cpp::Process},


warning: no header providing "Cpp::Process" is directly included [misc-include-cleaner]

{"Process", (__CPP_FUNC)Cpp::Process}, ^

github-actions · 2025-10-15T14:26:28Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"GetInterpreter", (__CPP_FUNC)Cpp::GetInterpreter},
+    {"CreateInterpreter", (__CPP_FUNC)Cpp::CreateInterpreter},
+    {"Process", (__CPP_FUNC)Cpp::Process},
+    {"GetResourceDir", (__CPP_FUNC)Cpp::GetResourceDir},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"GetResourceDir", (__CPP_FUNC)Cpp::GetResourceDir}, ^

github-actions · 2025-10-15T14:26:28Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"GetInterpreter", (__CPP_FUNC)Cpp::GetInterpreter},
+    {"CreateInterpreter", (__CPP_FUNC)Cpp::CreateInterpreter},
+    {"Process", (__CPP_FUNC)Cpp::Process},
+    {"GetResourceDir", (__CPP_FUNC)Cpp::GetResourceDir},


warning: no header providing "Cpp::GetResourceDir" is directly included [misc-include-cleaner]

{"GetResourceDir", (__CPP_FUNC)Cpp::GetResourceDir}, ^

mcbarton · 2025-10-15T19:12:14Z

unittests/CMakeLists.txt

-else()
-  add_test(NAME cppinterop-${name} COMMAND ${name})
-endif()
+  if(WIN32)


You have have an entire commit for this format change to cmake, but I have no idea what it has to do with adding a CppInterOp API for a dispatch mechanism. Please revert this change and put it a separate PR if you think this change needs to be made

As this is a draft, I have included commits that will move into a seperate PR

mcbarton · 2025-10-15T19:14:23Z

unittests/CppInterOp/CMakeLists.txt

  "LLVM_BINARY_DIR=\"${LLVM_BINARY_DIR}\""
 )
+set_source_files_properties(DispatchAPITest.cpp PROPERTIES COMPILE_DEFINITIONS
+  "CPPINTEROP_LIB_DIR=\"${CMAKE_BINARY_DIR}/lib/libclangCppInterOp.so\""


I'm assuming your going to make this test file inclusion dependent on whether CppInterOp was built as a shared or static library?

mcbarton · 2025-10-15T19:48:17Z

unittests/CppInterOp/CMakeLists.txt

  "LLVM_BINARY_DIR=\"${LLVM_BINARY_DIR}\""
 )
+set_source_files_properties(DispatchAPITest.cpp PROPERTIES COMPILE_DEFINITIONS
+  "CPPINTEROP_LIB_DIR=\"${CMAKE_BINARY_DIR}/lib/libclangCppInterOp.so\""


The library will only have a .so extension on Linux and Emscripten. The extension will need to be ${CMAKE_SHARED_LIBRARY_SUFFIX}

vgvassilev · 2025-10-16T07:45:31Z

include/CppInterOp/CppInterOpDispatch.h

+// a consistent way. This is used as our dispatched API list, along with the
+// name-address pair table
+#define FOR_EACH_CPP_FUNCTION(DO)                                              \
+  DO(CreateInterpreter)                                                        \


This can take a pair <CreateInterpreter, Type> and in this case you can write the using clauses automatically. We can also use clang-tablegen to generate these for every function in the namespace Cpp.

github-actions

clang-tidy made some suggestions

There were too many comments to post at once. Showing the first 10 out of 249. Check the log or trigger a new build to see more.

github-actions · 2025-10-21T15:45:31Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"CreateInterpreter", (__CPP_FUNC)Cpp::CreateInterpreter},
+    {"Process", (__CPP_FUNC)Cpp::Process},
+    {"GetResourceDir", (__CPP_FUNC)Cpp::GetResourceDir},
+    {"AddIncludePath", (__CPP_FUNC)Cpp::AddIncludePath},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"AddIncludePath", (__CPP_FUNC)Cpp::AddIncludePath}, ^

github-actions · 2025-10-21T15:45:31Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"CreateInterpreter", (__CPP_FUNC)Cpp::CreateInterpreter},
+    {"Process", (__CPP_FUNC)Cpp::Process},
+    {"GetResourceDir", (__CPP_FUNC)Cpp::GetResourceDir},
+    {"AddIncludePath", (__CPP_FUNC)Cpp::AddIncludePath},


warning: no header providing "Cpp::AddIncludePath" is directly included [misc-include-cleaner]

{"AddIncludePath", (__CPP_FUNC)Cpp::AddIncludePath}, ^

github-actions · 2025-10-21T15:45:31Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"Process", (__CPP_FUNC)Cpp::Process},
+    {"GetResourceDir", (__CPP_FUNC)Cpp::GetResourceDir},
+    {"AddIncludePath", (__CPP_FUNC)Cpp::AddIncludePath},
+    {"LoadLibrary", (__CPP_FUNC)Cpp::LoadLibrary},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"LoadLibrary", (__CPP_FUNC)Cpp::LoadLibrary}, ^

github-actions · 2025-10-21T15:45:31Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"Process", (__CPP_FUNC)Cpp::Process},
+    {"GetResourceDir", (__CPP_FUNC)Cpp::GetResourceDir},
+    {"AddIncludePath", (__CPP_FUNC)Cpp::AddIncludePath},
+    {"LoadLibrary", (__CPP_FUNC)Cpp::LoadLibrary},


warning: no header providing "Cpp::LoadLibrary" is directly included [misc-include-cleaner]

{"LoadLibrary", (__CPP_FUNC)Cpp::LoadLibrary}, ^

github-actions · 2025-10-21T15:45:31Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"GetResourceDir", (__CPP_FUNC)Cpp::GetResourceDir},
+    {"AddIncludePath", (__CPP_FUNC)Cpp::AddIncludePath},
+    {"LoadLibrary", (__CPP_FUNC)Cpp::LoadLibrary},
+    {"Declare", (__CPP_FUNC)Cpp::Declare},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"Declare", (__CPP_FUNC)Cpp::Declare}, ^

github-actions · 2025-10-21T15:45:32Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"GetResourceDir", (__CPP_FUNC)Cpp::GetResourceDir},
+    {"AddIncludePath", (__CPP_FUNC)Cpp::AddIncludePath},
+    {"LoadLibrary", (__CPP_FUNC)Cpp::LoadLibrary},
+    {"Declare", (__CPP_FUNC)Cpp::Declare},


warning: no header providing "Cpp::Declare" is directly included [misc-include-cleaner]

{"Declare", (__CPP_FUNC)Cpp::Declare}, ^

github-actions · 2025-10-21T15:45:32Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"AddIncludePath", (__CPP_FUNC)Cpp::AddIncludePath},
+    {"LoadLibrary", (__CPP_FUNC)Cpp::LoadLibrary},
+    {"Declare", (__CPP_FUNC)Cpp::Declare},
+    {"DeleteInterpreter", (__CPP_FUNC)Cpp::DeleteInterpreter},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"DeleteInterpreter", (__CPP_FUNC)Cpp::DeleteInterpreter}, ^

github-actions · 2025-10-21T15:45:32Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"AddIncludePath", (__CPP_FUNC)Cpp::AddIncludePath},
+    {"LoadLibrary", (__CPP_FUNC)Cpp::LoadLibrary},
+    {"Declare", (__CPP_FUNC)Cpp::Declare},
+    {"DeleteInterpreter", (__CPP_FUNC)Cpp::DeleteInterpreter},


warning: no header providing "Cpp::DeleteInterpreter" is directly included [misc-include-cleaner]

{"DeleteInterpreter", (__CPP_FUNC)Cpp::DeleteInterpreter}, ^

github-actions · 2025-10-21T15:45:32Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"LoadLibrary", (__CPP_FUNC)Cpp::LoadLibrary},
+    {"Declare", (__CPP_FUNC)Cpp::Declare},
+    {"DeleteInterpreter", (__CPP_FUNC)Cpp::DeleteInterpreter},
+    {"IsNamespace", (__CPP_FUNC)Cpp::IsNamespace},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"IsNamespace", (__CPP_FUNC)Cpp::IsNamespace}, ^

github-actions · 2025-10-21T15:45:32Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"LoadLibrary", (__CPP_FUNC)Cpp::LoadLibrary},
+    {"Declare", (__CPP_FUNC)Cpp::Declare},
+    {"DeleteInterpreter", (__CPP_FUNC)Cpp::DeleteInterpreter},
+    {"IsNamespace", (__CPP_FUNC)Cpp::IsNamespace},


warning: no header providing "Cpp::IsNamespace" is directly included [misc-include-cleaner]

{"IsNamespace", (__CPP_FUNC)Cpp::IsNamespace}, ^

This defines the mechanism which enables dispatching of the CppInterOp API without linking to it, preventing any LLVM or Clang symbols from being leaked into the client application. Can be used to deploy CppInterOp in an environment where dynamic linking is not favourable and the only option is dlopen'ing `libClangCppInterOp.so` with `RTLD_LOCAL`

to be followed up with a section in docs

github-actions

clang-tidy made some suggestions

There were too many comments to post at once. Showing the first 10 out of 126. Check the log or trigger a new build to see more.

github-actions · 2025-10-21T16:46:36Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"Declare", (__CPP_FUNC)Cpp::Declare},
+    {"DeleteInterpreter", (__CPP_FUNC)Cpp::DeleteInterpreter},
+    {"IsNamespace", (__CPP_FUNC)Cpp::IsNamespace},
+    {"ObjToString", (__CPP_FUNC)Cpp::ObjToString},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"ObjToString", (__CPP_FUNC)Cpp::ObjToString}, ^

github-actions · 2025-10-21T16:46:36Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"DeleteInterpreter", (__CPP_FUNC)Cpp::DeleteInterpreter},
+    {"IsNamespace", (__CPP_FUNC)Cpp::IsNamespace},
+    {"ObjToString", (__CPP_FUNC)Cpp::ObjToString},
+    {"GetQualifiedCompleteName", (__CPP_FUNC)Cpp::GetQualifiedCompleteName},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"GetQualifiedCompleteName", (__CPP_FUNC)Cpp::GetQualifiedCompleteName}, ^

github-actions · 2025-10-21T16:46:37Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"IsNamespace", (__CPP_FUNC)Cpp::IsNamespace},
+    {"ObjToString", (__CPP_FUNC)Cpp::ObjToString},
+    {"GetQualifiedCompleteName", (__CPP_FUNC)Cpp::GetQualifiedCompleteName},
+    {"IsLValueReferenceType", (__CPP_FUNC)Cpp::IsLValueReferenceType},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"IsLValueReferenceType", (__CPP_FUNC)Cpp::IsLValueReferenceType}, ^

github-actions · 2025-10-21T16:46:37Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"ObjToString", (__CPP_FUNC)Cpp::ObjToString},
+    {"GetQualifiedCompleteName", (__CPP_FUNC)Cpp::GetQualifiedCompleteName},
+    {"IsLValueReferenceType", (__CPP_FUNC)Cpp::IsLValueReferenceType},
+    {"GetNonReferenceType", (__CPP_FUNC)Cpp::GetNonReferenceType},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"GetNonReferenceType", (__CPP_FUNC)Cpp::GetNonReferenceType}, ^

github-actions · 2025-10-21T16:46:37Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"GetQualifiedCompleteName", (__CPP_FUNC)Cpp::GetQualifiedCompleteName},
+    {"IsLValueReferenceType", (__CPP_FUNC)Cpp::IsLValueReferenceType},
+    {"GetNonReferenceType", (__CPP_FUNC)Cpp::GetNonReferenceType},
+    {"IsEnumType", (__CPP_FUNC)Cpp::IsEnumType},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"IsEnumType", (__CPP_FUNC)Cpp::IsEnumType}, ^

github-actions · 2025-10-21T16:46:37Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"IsLValueReferenceType", (__CPP_FUNC)Cpp::IsLValueReferenceType},
+    {"GetNonReferenceType", (__CPP_FUNC)Cpp::GetNonReferenceType},
+    {"IsEnumType", (__CPP_FUNC)Cpp::IsEnumType},
+    {"GetIntegerTypeFromEnumType", (__CPP_FUNC)Cpp::GetIntegerTypeFromEnumType},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"GetIntegerTypeFromEnumType", (__CPP_FUNC)Cpp::GetIntegerTypeFromEnumType}, ^

github-actions · 2025-10-21T16:46:37Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"GetNonReferenceType", (__CPP_FUNC)Cpp::GetNonReferenceType},
+    {"IsEnumType", (__CPP_FUNC)Cpp::IsEnumType},
+    {"GetIntegerTypeFromEnumType", (__CPP_FUNC)Cpp::GetIntegerTypeFromEnumType},
+    {"GetReferencedType", (__CPP_FUNC)Cpp::GetReferencedType},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"GetReferencedType", (__CPP_FUNC)Cpp::GetReferencedType}, ^

github-actions · 2025-10-21T16:46:37Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"IsEnumType", (__CPP_FUNC)Cpp::IsEnumType},
+    {"GetIntegerTypeFromEnumType", (__CPP_FUNC)Cpp::GetIntegerTypeFromEnumType},
+    {"GetReferencedType", (__CPP_FUNC)Cpp::GetReferencedType},
+    {"IsPointerType", (__CPP_FUNC)Cpp::IsPointerType},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"IsPointerType", (__CPP_FUNC)Cpp::IsPointerType}, ^

github-actions · 2025-10-21T16:46:37Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"GetIntegerTypeFromEnumType", (__CPP_FUNC)Cpp::GetIntegerTypeFromEnumType},
+    {"GetReferencedType", (__CPP_FUNC)Cpp::GetReferencedType},
+    {"IsPointerType", (__CPP_FUNC)Cpp::IsPointerType},
+    {"GetPointeeType", (__CPP_FUNC)Cpp::GetPointeeType},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"GetPointeeType", (__CPP_FUNC)Cpp::GetPointeeType}, ^

github-actions · 2025-10-21T16:46:37Z

lib/CppInterOp/CppInterOpDispatch.cpp

+    {"GetReferencedType", (__CPP_FUNC)Cpp::GetReferencedType},
+    {"IsPointerType", (__CPP_FUNC)Cpp::IsPointerType},
+    {"GetPointeeType", (__CPP_FUNC)Cpp::GetPointeeType},
+    {"GetPointerType", (__CPP_FUNC)Cpp::GetPointerType},


warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast]

{"GetPointerType", (__CPP_FUNC)Cpp::GetPointerType}, ^

aaronj0 requested review from Vipul-Cariappa and vgvassilev October 15, 2025 12:22

aaronj0 marked this pull request as draft October 15, 2025 12:23

aaronj0 force-pushed the interop-dispatch branch from e259123 to badab56 Compare October 15, 2025 13:44

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aaronj0 force-pushed the interop-dispatch branch from badab56 to 3f72c0b Compare October 15, 2025 14:13

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mcbarton requested changes Oct 15, 2025

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aaronj0 force-pushed the interop-dispatch branch from 3f72c0b to 624d59a Compare October 21, 2025 15:22

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aaronj0 added 2 commits October 21, 2025 17:49

[tests] Provide unittest/example for API dispatch mechanism

460f493

to be followed up with a section in docs

aaronj0 force-pushed the interop-dispatch branch from 624d59a to 460f493 Compare October 21, 2025 15:51

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		#include <CppInterOp/CppInterOp.h>

		using __CPP_FUNC = void (*)();


		#include <unordered_map>

		static const FunctionEntry api_function_table[] = {

Add CppInterOp API dispatch mechanism #730

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aaronj0 commented Oct 15, 2025 •

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