Revert "Allow PdqHash to Target .NET 9 & 10."

This reverts commit e8c5011.

Author: ShaunWatsonCrisp

src/PdqHash/Extensions/CachedAsyncEnumerable.cs

@@ -9,10 +9,4 @@ public class CachedAsyncEnumerable<T>(IAsyncEnumerable<T> asyncEnumerable) : IAs
 
     public IAsyncEnumerator<T> GetAsyncEnumerator(CancellationToken cancellationToken = default) =>
         new CachedAsyncEnumerator<T>(_materialized, _asyncEnumerator);
-
-    /// <summary>
-    /// Returns the number of elements that have been materialized so far.
-    /// This is only accurate after the enumerable has been fully consumed.
-    /// </summary>
-    public int Count => _materialized.Count;
 }

src/PdqHash/PdqHash.csproj

@@ -6,7 +6,7 @@
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <PackageReadmeFile>README.md</PackageReadmeFile>
 
-    <TargetFrameworks>net9.0;net10.0</TargetFrameworks>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>

src/PdqHash/PdqHash256.cs

@@ -297,7 +297,7 @@ public string dumpBitsAcross()
 
     public string dumpWords()
     {
-        return string.Join(",", Enumerable.Reverse(w).Select(w => w.ToString(CultureInfo.InvariantCulture)));
+        return string.Join(",", w.Reverse().Select(w => w.ToString(CultureInfo.InvariantCulture)));
     }
 
     public int[] Words() => w.ToArray();

src/PdqHash/Video/VPdqComparer.cs

@@ -97,8 +97,8 @@ public static bool CalculateMatch(IReadOnlySet<VPdqHash> left, IReadOnlySet<VPdq
             }
         }
 
-        var leftMatchPercent = leftFramesMatched * 100 / l.Count;
-        var rightMatchPercent = rightFramesMatched * 100 / r.Count;
+        var leftMatchPercent = leftFramesMatched * 100 / await l.CountAsync();
+        var rightMatchPercent = rightFramesMatched * 100 / await r.CountAsync();
 
         return (leftMatchPercent > matchThreshold || rightMatchPercent > matchThreshold, leftMatchPercent, rightMatchPercent);
     }