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Investigation: O(n²) scaling in CombineCcuContentFragments for large projects

Status: Draft (not ready).

dotnet/fsharpnumber 19138

#19138 In dotnet/fsharp;

· Copilot opened on Dec 5, 2025

Add automated performance profiling suite with trace analysis for xUnit Assert.Equal compilation issue (#18807)

Status: Draft (not ready).

dotnet/fsharpnumber 19072

#19072 In dotnet/fsharp;

· Copilot opened on Nov 11, 2025

Fix object expressions in struct types generating invalid IL with byref fields

Status: Draft (not ready).

dotnet/fsharpnumber 19070

#19070 In dotnet/fsharp;

· Copilot opened on Nov 11, 2025

[WIP] Fix compilation error for OptionalArgument on delegates

Status: Draft (not ready).

dotnet/fsharpnumber 19069

#19069 In dotnet/fsharp;

· Copilot opened on Nov 11, 2025

Add regression tests for FSharpPlus consumer scenarios affected by F# 9

Status: Draft (not ready).

dotnet/fsharpnumber 19008

#19008 In dotnet/fsharp;

· Copilot opened on Oct 16, 2025

xUnit3 migration - Complete with IDataAttribute interface pattern (5,939+ tests passing)

Status: Draft (not ready).

dotnet/fsharpnumber 18950

#18950 In dotnet/fsharp;

· Copilot opened on Oct 1, 2025

Add warning for XML documentation comments not positioned as first non-whitespace on line

Status: Draft (not ready).

dotnet/fsharpnumber 18891

#18891 In dotnet/fsharp;

· Copilot opened on Sep 8, 2025

Fix nullness flow for type aliases after null pattern

Status: Draft (not ready).

dotnet/fsharpnumber 18852

#18852 In dotnet/fsharp;

· Copilot opened on Aug 15, 2025

Detect and error on duplicate static extension member container names in the same module (same name, different namespaces)

Status: Open (in progress).

dotnet/fsharpnumber 18821

#18821 In dotnet/fsharp;

· Copilot opened on Aug 5, 2025

Add time and space complexity documentation to Seq module functions

Status: Draft (not ready).

dotnet/fsharpnumber 18796

#18796 In dotnet/fsharp;

· Copilot opened on Jul 30, 2025

Add time and space complexity XML documentation to collection operators in FSharp.Core

Status: Draft (not ready).

dotnet/fsharpnumber 18795

#18795 In dotnet/fsharp;

· Copilot opened on Jul 30, 2025

Add time and space complexity documentation to all public functions in Map module

Status: Draft (not ready).

dotnet/fsharpnumber 18794

#18794 In dotnet/fsharp;

· Copilot opened on Jul 30, 2025