Use merge pattern.

ArrayIsEmpty.cs

@@ -40,7 +40,7 @@ public static partial class ArrayHelpers
     /// <summary>Checks if an array is null, filled with the NULL byte (0x00) or ASCII whitespace (0x20)</summary>
     /// <param name="array">Array</param>
     /// <returns>True if null or whitespace</returns>
-    public static bool ArrayIsNullOrWhiteSpace(byte[] array) => array?.All(b => b == 0x00 || b == 0x20) != false;
+    public static bool ArrayIsNullOrWhiteSpace(byte[] array) => array?.All(b => b is 0x00 or 0x20) != false;
 
     /// <summary>Checks if an array is null or filled with the NULL byte (0x00)</summary>
     /// <param name="array">Array</param>

DateHandlers.cs

@@ -302,8 +302,7 @@ public static class DateHandlers
         if(offset == -2047)
             return new DateTime(year, month, day, hour, minute, second, DateTimeKind.Unspecified).AddTicks(ticks);
 
-        if(offset < -1440 ||
-           offset > 1440)
+        if(offset is < -1440 or > 1440)
             offset = 0;
 
         return new DateTimeOffset(year, month, day, hour, minute, second, new TimeSpan(0, offset, 0)).AddTicks(ticks).

Marshal.cs

@@ -439,8 +439,7 @@ public static class Marshal
     {
         outBuf = null;
 
-        if(hex is null ||
-           hex == "")
+        if(hex is null or "")
             return -1;
 
         var off = 0;