Drop the second comma search from Content-Length folding

src/Glyph11/Validation/BodyFramingDetector.cs

@@ -1,3 +1,4 @@
+using System.Runtime.CompilerServices;
 using Glyph11.Parser;
 using Glyph11.Protocol;
 
@@ -100,6 +101,7 @@ public static BodyFramingResult DetectResponseBodyFraming(
     /// (<see cref="ContentLengthFields.Absent"/> when there are none).
     /// </summary>
     /// <exception cref="HttpParseException">The Content-Length fields disagree.</exception>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private static long ScanFramingFields(KeyValueList headers, out bool hasChunkedTE)
     {
         long contentLength = ContentLengthFields.Absent;
@@ -135,14 +137,13 @@ internal static ReadOnlySpan<byte> TrimOws(ReadOnlySpan<byte> value)
         return value[start..end];
     }
 
-    internal static long ParseContentLengthDigits(ReadOnlySpan<byte> value)
+    /// <summary>
+    /// One decimal length with no list or whitespace around it — <see cref="ContentLengthFields.Fold"/>
+    /// splits and trims each field first: <c>-1</c> if it is empty or not all digits,
+    /// <see cref="long.MaxValue"/> if a long cannot hold it.
+    /// </summary>
+    internal static long ParseDecimalDigits(ReadOnlySpan<byte> value)
     {
-        // Handle comma-separated: take first segment, without the OWS a list allows before its
-        // comma - "5 ,5" is 5 (RFC 9110 §5.6.1), exactly as the validator read it.
-        int comma = value.IndexOf((byte)',');
-        if (comma >= 0)
-            value = TrimOws(value[..comma]);
-
         if (value.IsEmpty) return -1;
 
         const long Limit = long.MaxValue / 10;   // any digit may follow a smaller value

src/Glyph11/Validation/ContentLengthFields.cs

@@ -41,7 +41,7 @@ internal static void Fold(ref long length, ReadOnlySpan<byte> fieldValue)
             if (!element.IsEmpty)
             {
                 sawElement = true;
-                Merge(ref length, BodyFramingDetector.ParseContentLengthDigits(element));
+                Merge(ref length, BodyFramingDetector.ParseDecimalDigits(element));
             }
 
             if (comma < 0)