Conditional in unsafe code prints (IntPtr) casts where nint was used

[siegfriedpammer]

Input code

SharpCompress 1.0.0, SharpCompress.Compressors.ZStandard.Unsafe.Methods (the ZSTD_decompressStream
region), decompiled with unsafe code and native integers enabled:

ilspycmd ~/.cache/nugetfuzz/sharpcompress/1.0.0/lib/net10.0/SharpCompress.dll \
    -t SharpCompress.Compressors.ZStandard.Unsafe.Methods

Erroneous output

Current master (dbf23c6) uses nint throughout:

return (nuint)((((nuint)((zds->format == ZSTD_format_e.ZSTD_f_zstd1) ? 6 : 2) > num7)
    ? ((nint)((zds->format == ZSTD_format_e.ZSTD_f_zstd1) ? 6 : 2))
    : ((nint)num7)) - (nint)zds->lhSize + 3);

With #4091 (6fcb387) the branches are cast to IntPtr instead, and one of them keeps the nint
cast underneath:

return (nuint)((nint)(((nuint)((zds->format == ZSTD_format_e.ZSTD_f_zstd1) ? 6 : 2) > num7)
    ? ((IntPtr)((zds->format == ZSTD_format_e.ZSTD_f_zstd1) ? 6 : 2))
    : ((IntPtr)(nint)num7)) - (nint)zds->lhSize + 3);

Same type either way, so this is readability only: with the native-integer setting on, the
conditional should keep printing nint rather than falling back to IntPtr.

Details

• Product in use: ICSharpCode.Decompiler, built from source
• Version in use: not reproducible on master (dbf23c6); measured at 6fcb387 against merge base
  712ad1a, over the top-200 nuget.org packages. One type in the corpus is affected.

Filed by an AI agent (Claude) on Siegfried's behalf.