excluded Replace() and Count() for Versions later or equal to net8.0 to avoid conflicts with methods present in these versions

Author: dragon7307

src/Extensions/ReadOnlySpan/Linq/Count.cs

@@ -4,6 +4,8 @@ namespace SpanExtensions
 {
     public static partial class ReadOnlySpanExtensions
     {
+#if !NET8_0_OR_GREATER // support for this method has been added in .Net 8. Just include it for backward-compatibility. 
+
         /// <summary>
         /// Returns the number of elements in a <see cref="ReadOnlySpan{T}"/>.
         /// </summary>
@@ -15,7 +17,7 @@ public static int Count<T>(this ReadOnlySpan<T> source)
         {
             return source.Length;
         }
-
+#endif
         /// <summary>
         /// Returns a number that represents how many elements in the specified sequence satisfy a condition.
         /// </summary>

src/Extensions/Span/Linq/Count.cs

@@ -4,6 +4,7 @@ namespace SpanExtensions
 {
     public static partial class SpanExtensions
     {
+#if !NET8_0_OR_GREATER // support for this method has been added in .Net 8. Just include it for backward-compatibility. 
         /// <summary>
         /// Returns the number of elements in a <see cref="Span{T}"/>.
         /// </summary>
@@ -15,7 +16,7 @@ public static int Count<T>(this Span<T> source)
         {
             return ReadOnlySpanExtensions.Count<T>(source);
         }
-
+#endif
         /// <summary>
         /// Returns a number that represents how many elements in the specified sequence satisfy a condition.
         /// </summary>

src/Extensions/Span/String/Replace.cs

@@ -1,4 +1,6 @@
-using System;
+#if !NET8_0_OR_GREATER // support for this method has been added in .Net 8. Just include it for backward-compatibility. 
+
+using System;
 
 namespace SpanExtensions
 {
@@ -22,4 +24,5 @@ public static void Replace<T>(this Span<T> source, T oldT, T newT) where T : IEq
             }
         }
     }
-}
+}
+#endif