Better error message for toPrimitive type checks

Author: patrickfav

src/main/java/at/favre/lib/bytes/Util.java

@@ -431,7 +431,7 @@ static void checkIndexBounds(int length, int index, int primitiveLength, String
 
     static void checkExactLength(int length, int expectedLength, String type) {
         if (length != expectedLength) {
-            throw new IllegalStateException("cannot convert to " + type + " if length != " + expectedLength + " bytes");
+            throw new IllegalStateException("cannot convert to " + type + " if length != " + expectedLength + " bytes (was " + length + ")");
         }
     }