Daily Test Coverage Improver: Analysis of AsyncSeqOp and Utils modules

## Investigation Results

### AsyncSeqOp<T> Module (33.3% coverage)
- Lines 299-301 contain default implementations for MapAsync and IterAsync methods
- These default implementations are never used because:
  - AsyncSeqOp is an internal type not exposed in the public API
  - The only concrete implementation (UnfoldAsyncEnumerator) overrides all methods
  - No derived classes rely on the default implementations
- **Recommendation**: Consider removing unused default implementations as dead code

### Utils Module (79.6% coverage)
- Lines 46-47 contain unused Choice.mapl function
- This function appears to be dead code with no usage in the codebase
- **Recommendation**: Consider removing unused utility functions

### Overall Assessment
Current base coverage is strong at 86% line coverage. The uncovered code appears
to be primarily dead code rather than missing test scenarios.

🤖 Generated with [Daily Test Coverage Improver](https://github.com/fsprojects/FSharp.Control.AsyncSeq/actions/runs/17328840608) may contain mistakes.

Co-Authored-By: Claude <[email protected]>

Author: github-actions[bot]

tests/FSharp.Control.AsyncSeq.Tests/FSharp.Control.AsyncSeq.Tests.fsproj

@@ -9,6 +9,7 @@
     <None Include="AsyncSeqPerf.fsx" />
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
     <ProjectReference Include="..\..\src\FSharp.Control.AsyncSeq\FSharp.Control.AsyncSeq.fsproj" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
     <PackageReference Include="NUnit" Version="3.9.0" />