Improve test fromRdf#t0027.

- Improving the test coverage for use useNativeTypes algorithm in 8.5.2
  2.4.
- Remove the "True" and "False" boolean tests that can cause confusion
  that those words are special values.
- Add tests using a value of "notnative" typed to boolean, integer, and
  double. These test that the type will be preserved when a native
  conversion does not happen.

Author: davidlehn

tests/fromRdf/0027-in.nq

@@ -4,11 +4,13 @@
 <http://example.com/boolean-number> <http://example.com/example> "1"^^<http://www.w3.org/2001/XMLSchema#boolean> .
 <http://example.com/boolean-number> <http://example.com/example> "0"^^<http://www.w3.org/2001/XMLSchema#boolean> .
 
-<http://example.com/boolean-object> <http://example.com/example> "True"^^<http://www.w3.org/2001/XMLSchema#boolean> .
-<http://example.com/boolean-object> <http://example.com/example> "False"^^<http://www.w3.org/2001/XMLSchema#boolean> .
+<http://example.com/boolean-object> <http://example.com/example> "notnative"^^<http://www.w3.org/2001/XMLSchema#boolean> .
 
 <http://example.com/number-native> <http://example.com/example> "1"^^<http://www.w3.org/2001/XMLSchema#integer> .
 
 <http://example.com/number-object> <http://example.com/example> "0.1e999999999999999"^^<http://www.w3.org/2001/XMLSchema#double> .
 <http://example.com/number-object> <http://example.com/example> "+INF"^^<http://www.w3.org/2001/XMLSchema#double> .
 <http://example.com/number-object> <http://example.com/example> "-INF"^^<http://www.w3.org/2001/XMLSchema#double> .
+
+<http://example.com/number-object> <http://example.com/example> "notnative"^^<http://www.w3.org/2001/XMLSchema#integer> .
+<http://example.com/number-object> <http://example.com/example> "notnative"^^<http://www.w3.org/2001/XMLSchema#double> .

tests/fromRdf/0027-out.jsonld

@@ -18,11 +18,7 @@
     "http://example.com/example": [
       {
         "@type": "http://www.w3.org/2001/XMLSchema#boolean",
-        "@value": "True"
-      },
-      {
-        "@type": "http://www.w3.org/2001/XMLSchema#boolean",
-        "@value": "False"
+        "@value": "notnative"
       }
     ]
   },
@@ -46,6 +42,14 @@
       {
         "@type": "http://www.w3.org/2001/XMLSchema#double",
         "@value": "-INF"
+      },
+      {
+        "@type": "http://www.w3.org/2001/XMLSchema#integer",
+        "@value": "notnative"
+      },
+      {
+        "@type": "http://www.w3.org/2001/XMLSchema#double",
+        "@value": "notnative"
       }
     ]
   }