Add tests for int and float JSON values and fix lexer regex

- Add 42 and 3.14 to TEST_JSON_VALUES to test numeric JSON parsing
- Fix EnhancedJsonLexer regex to handle prefixes before numeric JSON values
- Resolves FIXME comment about missing int & float test coverage

Author: sahelii

httpie/output/lexers/json.py

@@ -20,9 +20,8 @@ class EnhancedJsonLexer(RegexLexer):
     tokens = {
         'root': [
             # Eventual non-JSON data prefix followed by actual JSON body.
-            # FIX: data prefix + number (integer or float) is not correctly handled.
             (
-                fr'({PREFIX_REGEX})' + r'((?:[{\["]|true|false|null).+)',
+                fr'({PREFIX_REGEX})' + r'((?:[{\["]|true|false|null|-?\d).+)',
                 bygroups(PREFIX_TOKEN, using(JsonLexer))
             ),
             # JSON body.

tests/test_json.py

@@ -28,12 +28,13 @@
     '}',
 ]
 TEST_JSON_VALUES = [
-    # FIXME: missing int & float
     {},
     {'a': 0, 'b': 0},
     [],
     ['a', 'b'],
     'foo',
+    42,
+    3.14,
     True,
     False,
     None,