No release since v2.3.6-pre.1 (Oct 12): pack fails package validation (CP0014/CP0016/CP0015) after the Polyfill bump, so eight merged fixes (#138–#152) aren't on NuGet #153

What's wrong

Every CI run on main since 2026-10-14 (merge of #140; Polyfill 11.4.5 followed the same day in #141) fails in ci / .NET / Analyze & Release → Release: dotnet pack stops on package validation (Microsoft.NET.ApiCompat.ValidatePackage.targets(39,5)). Tests pass on all three OSes; only the pack/validate step fails. The last release is v2.3.6-pre.1 (2026-10-12), so nothing merged since has reached NuGet.

Errors in the latest run (2026-10-31): 30 × CP0014, 12 × CP0016, 3 × CP0015, 3 × CP0008, plus "Unnecessary suppressions found".

The diagnostics are on Polyfill's embedded shim types rather than this library's own API, e.g.

error CP0015: Cannot change arguments of attribute 'System.Runtime.CompilerServices.NullableContextAttribute' on 'System.Diagnostics.CodeAnalysis.ExperimentalAttribute'.
error CP0014: Cannot remove attribute 'System.Runtime.CompilerServices.NullableContextAttribute(2)' from 'System.Runtime.CompilerServices.DefaultInterpolatedStringHandler'.

The existing CodeBlocker/CompatibilitySuppressions.xml (33 lines) is stale as well: ApiCompat reports some of its entries as unnecessary.

The first red run coincides with the Polyfill 11.4.x → 11.4.5 bump landing on main. That's going by timing; I didn't bisect it.

Why it matters

• Unreleased on main right now: eight merged [patch] fixes: Start a new doc comment line at NEL, LINE SEPARATOR and PARAGRAPH SEPARATOR [patch] #138 (doc comment NEL/LS/PS line breaks), Escape a lone surrogate in a quoted string literal [patch] #139 (lone surrogate escaping), Reject an accessorless property or unknown operator kind before writing anything [patch] #140 (accessorless property / unknown operator rejected before writing), Leave the pending indentation alone on an empty Write [patch] #147 (empty Write keeps indent), Write a source file's global attributes after its usings [patch] #148 (global attributes after usings), Put an expression body's semicolon before a trailing line comment [patch] #149 (expression-body semicolon before a line comment), Reject an unknown type or accessor kind, or a bodiless expression accessor, before writing [patch] #150 (validate kind before writing) and Comment every line of a multi-line copyright, and refuse a multi-line region name [patch] #152 (multi-line copyright / region name). ktsu.SourceGeneratorToolkit consumes this package, so its generators don't get these fixes either.
• Any fix merged from here on also won't ship until pack is green again, and a daily red CI on main hides any new, real failure.

Suggested fix

Regenerate the API-compat suppressions the way ktsu-dev/Schema#295 did for the same failure. Build with the SDK and compiler CI uses (Windows runner, SDK 10.0.403), run dotnet pack -c Release -p:ApiCompatGenerateSuppressionFile=true on the library project, and commit the updated CompatibilitySuppressions.xml. That adds the Polyfill shim entries and removes stale ones.

Acceptance criteria

• dotnet pack -c Release of the library succeeds with package validation on and no suppression generation.
• The next scheduled CI run on main passes Analyze & Release and publishes a release.

Generated by Claude Code