Replaced Span<T>.Fill(0) with Span<T>.Clear() (#20023)

Author: gfoidl

src/Components/Server/src/BlazorPack/SequenceOfT.cs

@@ -443,7 +443,7 @@ private void ClearReferences(int startIndex, int length)
                 // If we store references, clear them to allow the objects to be GC'd.
                 if (!IsValueTypeElement)
                 {
-                    this.AvailableMemory.Span.Slice(startIndex, length).Fill(default);
+                    this.AvailableMemory.Span.Slice(startIndex, length).Clear();
                 }
             }
         }

src/Servers/Kestrel/test/InMemory.FunctionalTests/Http2/Http2TestBase.cs

@@ -545,7 +545,7 @@ protected Task SendHeadersWithPaddingAsync(int streamId, IEnumerable<KeyValuePai
 
             HPackHeaderWriter.BeginEncodeHeaders(_hpackEncoder, GetHeadersEnumerator(headers), payload, out var length);
             var padding = buffer.Slice(extendedHeaderLength + length, padLength);
-            padding.Fill(0);
+            padding.Clear();
 
             frame.PayloadLength = extendedHeaderLength + length + padLength;
 

src/Shared/Http2cat/Http2Utilities.cs

@@ -343,7 +343,7 @@ public Task SendHeadersWithPaddingAsync(int streamId, IEnumerable<KeyValuePair<s
 
             HPackHeaderWriter.BeginEncodeHeaders(GetHeadersEnumerator(headers), payload, out var length);
             var padding = buffer.Slice(extendedHeaderLength + length, padLength);
-            padding.Fill(0);
+            padding.Clear();
 
             frame.PayloadLength = extendedHeaderLength + length + padLength;
 
@@ -431,7 +431,7 @@ public Task SendHeadersWithPaddingAndPriorityAsync(int streamId, IEnumerable<Key
 
             HPackHeaderWriter.BeginEncodeHeaders(GetHeadersEnumerator(headers), payload, out var length);
             var padding = buffer.Slice(extendedHeaderLength + length, padLength);
-            padding.Fill(0);
+            padding.Clear();
 
             frame.PayloadLength = extendedHeaderLength + length + padLength;
 

src/Shared/HttpSys/RequestProcessing/NativeRequestContext.cs

@@ -53,7 +53,7 @@ internal NativeRequestContext(SafeNativeOverlapped nativeOverlapped, MemoryPool<
                 // No size limit
                 _backingBuffer = MemoryPool<byte>.Shared.Rent(newSize);
             }
-            _backingBuffer.Memory.Span.Fill(0);// Zero the buffer
+            _backingBuffer.Memory.Span.Clear();
             _memoryHandle = _backingBuffer.Memory.Pin();
             _nativeRequest = (HttpApiTypes.HTTP_REQUEST*)((long)_memoryHandle.Pointer + _bufferAlignment);