fix(grok): implement official hook contract

elydora/plugins/_strict_json.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import json
-from typing import Any, Dict, List, Tuple
+from typing import Any, Dict, List, NoReturn, Tuple
 
 
 JsonObject = Dict[str, Any]
@@ -13,6 +13,10 @@ class _DuplicateKey(ValueError):
     pass
 
 
+class _InvalidConstant(ValueError):
+    pass
+
+
 def _unique_object(pairs: List[Tuple[str, Any]]) -> JsonObject:
     result: JsonObject = {}
     for key, value in pairs:
@@ -22,10 +26,18 @@ def _unique_object(pairs: List[Tuple[str, Any]]) -> JsonObject:
     return result
 
 
+def _reject_constant(value: str) -> NoReturn:
+    raise _InvalidConstant(f'invalid numeric constant "{value}"')
+
+
 def parse_json_object(raw: str, label: str) -> JsonObject:
     try:
-        value = json.loads(raw, object_pairs_hook=_unique_object)
-    except (_DuplicateKey, json.JSONDecodeError) as error:
+        value = json.loads(
+            raw,
+            object_pairs_hook=_unique_object,
+            parse_constant=_reject_constant,
+        )
+    except (_DuplicateKey, _InvalidConstant, json.JSONDecodeError) as error:
         raise ValueError(f"Failed to parse {label}: {error}") from error
     if not isinstance(value, dict):
         raise ValueError(f"{label} must contain a JSON object")