fix: convert foreign array element-wise for trailing array parameter (#6678) by thomhurst · Pull Request #6681 · thomhurst/TUnit

thomhurst · 2026-08-26T17:42:39Z

Problem

#6122 made a trailing T[] parameter bind like params. For a single argument that is not already a T[], both modes wrapped it as one element via Cast<T>:

args[0] is null ? null : args[0] is KNOWN_CONFIGS[] arr ? arr : new KNOWN_CONFIGS[] { CastHelper.Cast<KNOWN_CONFIGS>(args[0]) }

Data sources frequently supply an array of a different runtime type — the reporter's MatrixArray helper (discussion #4596) yields an object[] per test case for a KNOWN_CONFIGS[] parameter. object[] is not KNOWN_CONFIGS[], so the whole array was forced into one element and Cast<KNOWN_CONFIGS>(object[]) threw. Reflection mode failed the same way (Array.SetValue(object[], 0) on an enum array). Pre-#6122 this worked because the non-params path used Cast<T[]>, which converts element-wise.

Fix

CastHelper.ToTrailingArray<T>(object) (new, AOT-safe — new T[] + Cast<T> per element):
1. value is T → one-element array (C# params expansion; params object[] still receives an int[] as a single element, like C#)
2. value is a rank-1 Array → convert element-wise ([Bug]: PR #6122 (allow targetting arrays in functions with args) was too broad breaking some use cases #6678)
3. otherwise → [Cast<T>(value)] (unchanged behaviour)
Source-gen (TupleArgumentHelper): single-argument branch now emits … is T[] arr ? arr : CastHelper.ToTrailingArray<T>(args[i]).
Reflection (ReflectionTestDataCollector): same three-way rule in the single-argument branch.

Null and already-typed T[] passthrough are untouched; multi-argument and dynamic-count paths are untouched.

Tests

ArgsAsArrayTests: new MatrixArray-driven cases for a plain ConfigKind[] and a params ConfigKind[] parameter (the reporter's scenario), plus a guard that params object[] still receives an int[] as one element.
Pass in source-gen and --reflection (net10.0), along with DataDrivenTests, MethodDataSourceDrivenTests, Bugs/2112, Bugs/6150.
Source-generator snapshots: 13 .verified.txt updated — the only change is the single-argument expression swap plus the new test entries.
TUnit.PublicAPI snapshots updated for the new public helper.

https://claude.ai/code/session_015Xx3PGYRU1KjEuEmzXMMpj

Summary by CodeRabbit

New Features
- Improved handling of trailing array parameters, including arrays with different runtime element types.
- Supports converting scalar values and object arrays into expected typed arrays.
- Preserves existing arrays and treats arrays passed to params object[] as single elements when appropriate.
Bug Fixes
- Fixed data-driven test invocation scenarios involving matrix-provided arrays, generic arrays, jagged arrays, and enumerable values.
Tests
- Added coverage for trailing array and params array argument conversion across supported runtimes.

Since #6122 a trailing `T[]` parameter binds like `params`: a single argument that is not already a `T[]` was wrapped as one element via `Cast<T>`. Data sources often supply an array of a different runtime type — e.g. an `object[]` from a MatrixAttribute subclass for a `MyEnum[]` parameter — which then failed with an InvalidCastException in both execution modes. Add `CastHelper.ToTrailingArray<T>` (AOT-safe: `new T[]` + `Cast<T>` per element) and use it from the generated single-argument branch; mirror the same rule in ReflectionTestDataCollector. Order matters: a value that is itself a `T` still wraps (C# params expansion, so `params object[]` keeps an `int[]` as one element); only an array that is not a `T` is converted element-wise. Closes #6678 Claude-Session: https://claude.ai/code/session_015Xx3PGYRU1KjEuEmzXMMpj

coderabbitai · 2026-08-26T17:43:53Z

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📒 Files selected for processing (4)

src/TUnit.Core/Helpers/CastHelper.cs
src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs
tests/TUnit.Core.SourceGenerator.Tests/ArgsAsArrayTests.Test.verified.txt
tests/TUnit.TestProject/ArgsAsArrayTests.cs

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📝 Walkthrough

Walkthrough

The change adds CastHelper.ToTrailingArray<T> and applies it to reflection and source-generated invocations. Runtime arrays are converted element by element, including arrays with non-zero lower bounds. Tests cover matrix arrays, params arrays, object-array behavior, generated output, and API baselines.

Changes

Trailing array conversion

Layer / File(s)	Summary
Add trailing array conversion helper `src/TUnit.Core/Helpers/CastHelper.cs`, `tests/TUnit.PublicAPI/*`	`ToTrailingArray<T>` preserves compatible values, converts one-dimensional arrays element by element, handles non-zero lower bounds, and wraps scalar values.
Update reflection invocation handling `src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs`	Reflection array conversion now reads elements from their actual lower-bound indexes.
Update generated invocations and coverage `src/TUnit.Core.SourceGenerator/...`, `tests/TUnit.TestProject/ArgsAsArrayTests.cs`, `tests/TUnit.Core.SourceGenerator.Tests/*`	Generated invocations use `ToTrailingArray<T>` for single trailing arguments. Tests cover matrix-sourced arrays, non-zero lower bounds, `params` arrays, object-array preservation, generated output, and target frameworks.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🔵 Low · up to 3daf8

The PR fixes foreign-array binding for trailing array parameters, but reflection and generated execution paths maintain separate conversion logic that could diverge in future changes; it is mergeable with explicit owner awareness or follow-up to keep both paths aligned.

Poem

A rabbit checks each array cell
Mismatched elements cast well
Scalar values form one-item rows
Lower bounds guide where reading goes
Generated calls use the helper
Tests verify every pathway

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❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 72.73% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 4 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: element-wise conversion of foreign arrays for trailing array parameters.
Linked Issues check	✅ Passed	The implementation meets issue `#6678` by converting rank-1 source arrays element by element, including non-zero lower bounds, while preserving null handling, compatible arrays, and params object-array …
Out of Scope Changes check	✅ Passed	The changes remain within scope. They update trailing array conversion, source generation, reflection binding, regression tests, snapshots, and public API baselines required by the implementation.

Full details: Linked Issues check

Explanation

The implementation meets issue #6678 by converting rank-1 source arrays element by element, including non-zero lower bounds, while preserving null handling, compatible arrays, and params object-array behavior. Source-generated and reflection-based paths are covered by regression tests.

Full details: Docstring Coverage

Explanation

Docstring coverage is 72.73% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 4 files. (1 skipped: 1 unsupported.)

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greptile-apps · 2026-08-26T17:46:28Z

Greptile Summary

The PR updates trailing-array argument binding so foreign rank-one arrays are converted element-wise while preserving scalar and already-typed-array behavior.

Adds CastHelper.ToTrailingArray<T> for source-generated invocation.
Aligns reflection-mode conversion with the same binding semantics.
Handles non-zero array lower bounds in both implementations.
Adds matrix-driven and params object[] regression coverage.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/TUnit.Core/Helpers/CastHelper.cs	Adds element-wise trailing-array conversion and correctly traverses rank-one arrays from their actual lower bound.
src/TUnit.Core.SourceGenerator/CodeGenerators/Helpers/TupleArgumentHelper.cs	Routes single foreign-array arguments through the new conversion helper while retaining null and typed-array passthrough.
src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs	Mirrors the source-generated binding rules and correctly offsets reads from non-zero-lower-bound arrays.
tests/TUnit.TestProject/ArgsAsArrayTests.cs	Adds regression coverage for foreign arrays, params arrays, scalar-preserving object-array semantics, and non-zero lower bounds.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Single trailing argument] --> B{Null?}
  B -->|Yes| C[Pass null]
  B -->|No| D{Already target array type?}
  D -->|Yes| E[Pass array directly]
  D -->|No| F{Assignable as one element?}
  F -->|Yes| G[Wrap as one-element array]
  F -->|No| H{Rank-one Array?}
  H -->|Yes| I[Read from GetLowerBound]
  I --> J[Convert each element]
  H -->|No| K[Convert scalar and wrap]

_{Reviews (2): Last reviewed commit: "fix: honour non-zero lower bound in trai..." | Re-trigger Greptile}

coderabbitai

Actionable comments posted: 2

🧹 Nitpick comments (1)

src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs (1)
1917-1946: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Duplicated trailing-array logic risks drifting from CastHelper.ToTrailingArray<T>.

This block reimplements CastHelper.ToTrailingArray<T> by hand because the element type is only available as a runtime Type here. The two implementations are logically equivalent today, but nothing enforces that they stay in sync. A future fix or edge-case change to CastHelper.ToTrailingArray<T> will not automatically apply to this reflection-mode copy.

Add a non-generic overload, for example CastHelper.ToTrailingArray(Type elementType, object value), that both ToTrailingArray<T> and this reflection path can call. This removes the duplicated conversion logic and keeps source-gen and reflection modes provably identical.

As per coding guidelines, "Changes to core engine metadata collection MUST work in both source-gen (TUnit.Core.SourceGenerator) AND reflection (TUnit.Engine) modes" and "Test both modes explicitly. Never assume parity without verification."
♻️ Suggested extraction (sketch)
+    // In CastHelper.cs
+    public static Array ToTrailingArray([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] Type elementType, object value)
+    {
+        if (elementType.IsInstanceOfType(value))
+        {
+            var singleElementArray = Array.CreateInstance(elementType, 1);
+            singleElementArray.SetValue(value, 0);
+            return singleElementArray;
+        }
+
+        if (value is Array { Rank: 1 } source)
+        {
+            var result = Array.CreateInstance(elementType, source.Length);
+            for (var i = 0; i < result.Length; i++)
+            {
+                result.SetValue(Cast(elementType, source.GetValue(i)), i);
+            }
+            return result;
+        }
+
+        var array = Array.CreateInstance(elementType, 1);
+        array.SetValue(Cast(elementType, value), 0);
+        return array;
+    }
ReflectionTestDataCollector would then call CastHelper.ToTrailingArray(paramsElementType, singleArg) (with the existing IsCovariantCompatible check kept as a pre-check, since that check does not apply to the source-gen path).
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In `@src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs` around lines 1917
- 1946, Extract the shared trailing-array conversion into a non-generic
CastHelper.ToTrailingArray(Type elementType, object value) overload, and have
both the generic ToTrailingArray<T> implementation and the
ReflectionTestDataCollector path use it. Replace the duplicated conversion
branches while preserving the existing IsCovariantCompatible pre-check and
behavior for compatible values, arrays, and scalar conversions; verify parity in
source-generated and reflection modes.
Source: Coding guidelines

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Inline comments:
In
`@src/TUnit.Core.SourceGenerator/CodeGenerators/Helpers/TupleArgumentHelper.cs`:
- Around line 149-153: Update CastHelper.ToTrailingArray and the corresponding
reflection params-binding path to iterate rank-1 arrays from GetLowerBound(0)
rather than assuming index zero. Preserve element ordering while supporting
non-zero-based arrays, and add an Array.CreateInstance regression test covering
a non-zero lower bound.

In `@tests/TUnit.TestProject/ArgsAsArrayTests.cs`:
- Around line 85-118: Update the assertions in
TrailingArray_ObjectArrayFromMatrix and
TrailingParamsArray_ObjectArrayFromMatrix to use CollectionOrdering.Matching
with IsEquivalentTo, so both tests verify element order as well as contents.

---

Nitpick comments:
In `@src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs`:
- Around line 1917-1946: Extract the shared trailing-array conversion into a
non-generic CastHelper.ToTrailingArray(Type elementType, object value) overload,
and have both the generic ToTrailingArray<T> implementation and the
ReflectionTestDataCollector path use it. Replace the duplicated conversion
branches while preserving the existing IsCovariantCompatible pre-check and
behavior for compatible values, arrays, and scalar conversions; verify parity in
source-generated and reflection modes.

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📒 Files selected for processing (21)

src/TUnit.Core.SourceGenerator/CodeGenerators/Helpers/TupleArgumentHelper.cs
src/TUnit.Core/Helpers/CastHelper.cs
src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs
tests/TUnit.Core.SourceGenerator.Tests/ArgsAsArrayTests.Test.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.DataDrivenTest_WithConflictingNamespace.DotNet10_0.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.DataDrivenTest_WithConflictingNamespace.DotNet8_0.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.DataDrivenTest_WithConflictingNamespace.DotNet9_0.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.DataDrivenTest_WithConflictingNamespace.Net4_7.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.MethodDataSource_WithConflictingNamespace.DotNet10_0.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.MethodDataSource_WithConflictingNamespace.DotNet8_0.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.MethodDataSource_WithConflictingNamespace.DotNet9_0.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/ConflictingNamespaceTests.MethodDataSource_WithConflictingNamespace.Net4_7.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/DataDrivenTests.Test.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/MethodDataSourceDrivenTests.Test.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/Tests2112.Test.verified.txt
tests/TUnit.Core.SourceGenerator.Tests/Tests6150.Test.verified.txt
tests/TUnit.PublicAPI/Tests.Core_Library_Has_No_API_Changes.DotNet10_0.verified.txt
tests/TUnit.PublicAPI/Tests.Core_Library_Has_No_API_Changes.DotNet8_0.verified.txt
tests/TUnit.PublicAPI/Tests.Core_Library_Has_No_API_Changes.DotNet9_0.verified.txt
tests/TUnit.PublicAPI/Tests.Core_Library_Has_No_API_Changes.Net4_7.verified.txt
tests/TUnit.TestProject/ArgsAsArrayTests.cs

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claude · 2026-08-26T17:50:38Z

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

What I verified:

Dual-mode consistency (root CLAUDE.md rule 1): the source-gen (TupleArgumentHelper.GenerateArgumentAccessWithParams) and reflection (ReflectionTestDataCollector) single-argument branches were updated in lockstep — both now check "is T" (params expansion) before "is a rank-1 array" (element-wise conversion) before falling back to a scalar cast, mirroring CastHelper.ToTrailingArray<T>.
Snapshot tests (rule 2): all 13 .verified.txt diffs are the mechanical new T[] { Cast<T>(x) } → ToTrailingArray<T>(x) swap plus new test entries; no .received.txt files are present in the diff.
AOT compatibility (rule 5): ToTrailingArray<T> is annotated with [DynamicallyAccessedMembers(PublicParameterlessConstructor)] matching Cast<T>, and the PublicAPI snapshots were updated for the new public helper across all four TFMs.
Built and ran ArgsAsArrayTests on the PR branch in both source-gen (net8.0/9.0/10.0) and --reflection (net10.0) modes — all pass, including the new MatrixArray-driven cases and the params object[] single-element guard.
Traced other GenerateArgumentAccessWithParams branches (dynamic-count, multi-argument) and the constructor-arg / regular-parameter casting paths in ReflectionTestDataCollector — none share this single-argument-wrapping logic, so no other call site needed the same fix.

No design or architectural concerns — the fix is narrowly scoped to the single-argument trailing-array branch and consistently applied across both execution modes.

Review feedback: a rank-1 array created with an explicit lower bound (`Array.CreateInstance(typeof(object), [2], [1])`) is `Array { Rank: 1 }` but indexing it from 0 throws. Start at GetLowerBound(0) in both CastHelper.ToTrailingArray<T> and the reflection-mode mirror, and add a regression test. Also assert element order in the new tests (IsEquivalentTo defaults to CollectionOrdering.Any). Claude-Session: https://claude.ai/code/session_015Xx3PGYRU1KjEuEmzXMMpj

thomhurst · 2026-08-26T17:55:01Z

Addressed in the latest commit:

Non-zero lower bound (Codex / Greptile / CodeRabbit): both CastHelper.ToTrailingArray<T> and the reflection mirror now iterate from GetLowerBound(0). Added TrailingArray_NonZeroLowerBoundArrayFromMatrix (Array.CreateInstance(typeof(object), [2], [1])) — passes in source-gen and --reflection.
Element order (CodeRabbit): the new tests use IsEquivalentTo(..., CollectionOrdering.Matching).
Extract non-generic ToTrailingArray(Type, object) (CodeRabbit nitpick): not doing this one. The generic overload must stay AOT-safe (new T[]), while a Type-based overload has to go through Array.CreateInstance (RequiresDynamicCode), so the two bodies can't share an implementation — extraction would only relocate the duplicate. The reflection collector already mirrors CastHelper inline this way for the multi-argument path, so the single-argument branch follows the same pattern.

https://claude.ai/code/session_015Xx3PGYRU1KjEuEmzXMMpj

claude · 2026-08-26T17:59:44Z

Code review

No issues found. Checked the latest commit (3daf8d3) against the prior review and against the CodeRabbit/Greptile feedback it was meant to address.

What changed since the last review:

CastHelper.ToTrailingArray<T> and the ReflectionTestDataCollector mirror now both read from source.GetLowerBound(0) + i instead of assuming a zero-based array, fixing the non-zero-lower-bound edge case flagged by Greptile/CodeRabbit. Verified this is applied consistently in both the source-gen (CastHelper) and reflection paths — no other GetValue(i)-style indexing sites in ReflectionTestDataCollector were missed.
New regression test TrailingArray_NonZeroLowerBoundArrayFromMatrix uses Array.CreateInstance(typeof(object), [2], [1]) to construct a genuinely non-zero-based array and asserts element order with CollectionOrdering.Matching — correctly exercises the fix (traced the indices: GetLowerBound(0) == 1, so the loop reads indices 1 and 2, matching the values set at those positions).
The declined nitpick (extracting a non-generic ToTrailingArray(Type, object) overload) is reasonable: the generic overload allocates via new T[] to stay AOT-safe, while a Type-based version would need Array.CreateInstance, which is RequiresDynamicCode. Sharing an implementation isn't possible without compromising the AOT-safe path, so keeping the reflection collector's inline mirror (consistent with how it already handles the multi-argument case) is the right call.

Dual-mode consistency, AOT annotations, and snapshot updates were already verified in the prior review and are unaffected by this commit.

Updated [TUnit](https://github.com/thomhurst/TUnit) from 1.65.63 to 1.65.68. <details> <summary>Release notes</summary> _Sourced from [TUnit's releases](https://github.com/thomhurst/TUnit/releases)._ ## 1.65.68  ## What's Changed ### Other Changes * fix: convert foreign array element-wise for trailing array parameter (#6678) by @thomhurst in thomhurst/TUnit#6681 ### Dependencies * chore(deps): update tunit to 1.65.63 by @thomhurst in thomhurst/TUnit#6672 * chore(deps): update aspire to 13.5.3 by @thomhurst in thomhurst/TUnit#6674 * chore(deps): update verify to v32 by @thomhurst in thomhurst/TUnit#6680 **Full Changelog**: thomhurst/TUnit@v1.65.63...v1.65.68 Commits viewable in [compare view](thomhurst/TUnit@v1.65.63...v1.65.68). </details> Updated [TUnit.AspNetCore](https://github.com/thomhurst/TUnit) from 1.65.63 to 1.65.68. <details> <summary>Release notes</summary> _Sourced from [TUnit.AspNetCore's releases](https://github.com/thomhurst/TUnit/releases)._ ## 1.65.68  ## What's Changed ### Other Changes * fix: convert foreign array element-wise for trailing array parameter (#6678) by @thomhurst in thomhurst/TUnit#6681 ### Dependencies * chore(deps): update tunit to 1.65.63 by @thomhurst in thomhurst/TUnit#6672 * chore(deps): update aspire to 13.5.3 by @thomhurst in thomhurst/TUnit#6674 * chore(deps): update verify to v32 by @thomhurst in thomhurst/TUnit#6680 **Full Changelog**: thomhurst/TUnit@v1.65.63...v1.65.68 Commits viewable in [compare view](thomhurst/TUnit@v1.65.63...v1.65.68). </details> Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- <details> <summary>Dependabot commands and options</summary> <br /> You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself) </details> Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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fix: convert foreign array element-wise for trailing array parameter (#6678) - #6681

fix: convert foreign array element-wise for trailing array parameter (#6678)#6681
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claude Bot commented Aug 26, 2026

Code review

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thomhurst commented Aug 26, 2026

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claude Bot commented Aug 26, 2026

Code review

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thomhurst commented Aug 26, 2026 •

edited by coderabbitai Bot

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coderabbitai Bot commented Aug 26, 2026 •

edited

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greptile-apps Bot commented Aug 26, 2026 •

edited

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