numbers in scarpet better handle long type values.

If possible, numbers that can be represented as longs (seeds, etc) will be handled as longs but they will loose their longinness with a single arithmetic operation.

src/main/java/carpet/script/Expression.java

@@ -1546,11 +1546,17 @@ public class Expression
         });
         addUnaryFunction("number", v -> {
             if (v instanceof NumericValue)
+            {
                 return v;
-            double res = v.readNumber();
-            if (Double.isNaN(res))
+            }
+            try
+            {
+                return new NumericValue(v.getString());
+            }
+            catch (NumberFormatException format)
+            {
                 return Value.NULL;
-            return new NumericValue(v.readNumber());
+            }
         });
         addFunction("str", lv ->
         {
@@ -1593,7 +1599,7 @@ public class Expression
                     {
                         if (argIndex >= lv.size())
                             throw new InternalExpressionException("Not enough arguments for "+m.group(0));
-                        args.add(lv.get(argIndex).readNumber());
+                        args.add(lv.get(argIndex).readDoubleNumber());
                         argIndex++;
                     }
                     else if (fmt == 'b')