Don't expose the underlying byte array directly from MySqlGeometry.

Author: bgrainger

src/MySqlConnector/MySql.Data.MySqlClient/MySqlBulkCopy.cs

@@ -402,7 +402,7 @@ static bool WriteValue(MySqlConnection connection, object? value, Span<byte> out
 					var inputSpan = value is byte[] byteArray ? byteArray.AsSpan() :
 						value is ArraySegment<byte> arraySegment ? arraySegment.AsSpan() :
 						value is Memory<byte> memory ? memory.Span :
-						value is MySqlGeometry geometry ? geometry.Value :
+						value is MySqlGeometry geometry ? geometry.ValueSpan :
 						((ReadOnlyMemory<byte>) value).Span;
 
 					return WriteBytes(inputSpan, output, out bytesWritten);

src/MySqlConnector/MySql.Data.MySqlClient/MySqlParameter.cs

@@ -284,7 +284,7 @@ internal void AppendSqlString(ByteBufferWriter writer, StatementPreparerOptions
 				var inputSpan = Value is byte[] byteArray ? byteArray.AsSpan() :
 					Value is ArraySegment<byte> arraySegment ? arraySegment.AsSpan() :
 					Value is Memory<byte> memory ? memory.Span :
-					Value is MySqlGeometry geometry ? geometry.Value :
+					Value is MySqlGeometry geometry ? geometry.ValueSpan :
 					((ReadOnlyMemory<byte>) Value).Span;
 
 				// determine the number of bytes to be written
@@ -503,8 +503,8 @@ internal void AppendBinary(ByteBufferWriter writer, StatementPreparerOptions opt
 			}
 			else if (Value is MySqlGeometry geometry)
 			{
-				writer.WriteLengthEncodedInteger(unchecked((ulong) geometry.Value.Length));
-				writer.Write(geometry.Value);
+				writer.WriteLengthEncodedInteger(unchecked((ulong) geometry.ValueSpan.Length));
+				writer.Write(geometry.ValueSpan);
 			}
 			else if (Value is float floatValue)
 			{

src/MySqlConnector/MySql.Data.Types/MySqlGeometry.cs

@@ -38,12 +38,14 @@ public static MySqlGeometry FromWkb(int srid, ReadOnlySpan<byte> wkb)
 		/// <summary>
 		/// The Well-known Binary serialization of this geometry.
 		/// </summary>
-		public ReadOnlySpan<byte> WKB => new ReadOnlySpan<byte>(Value).Slice(4);
+		public ReadOnlySpan<byte> WKB => ValueSpan.Slice(4);
 
 		/// <summary>
 		/// The internal MySQL form of this geometry.
 		/// </summary>
-		public byte[] Value => m_bytes;
+		public byte[] Value => ValueSpan.ToArray();
+
+		internal ReadOnlySpan<byte> ValueSpan => m_bytes;
 
 		internal MySqlGeometry(byte[] bytes) => m_bytes = bytes;