fix: handle unbounded JSON integers

Co-Authored-By: Codex <noreply@openai.com>

Author: Pigbibi

src/quant_platform_kit/strategy_spec/validation.py

@@ -455,7 +455,11 @@ def _parse_datetime(value: str) -> datetime | None:
 
 
 def _is_number(value: Any) -> bool:
-    return isinstance(value, (int, float)) and not isinstance(value, bool) and math.isfinite(value)
+    if isinstance(value, bool):
+        return False
+    if isinstance(value, int):
+        return True
+    return isinstance(value, float) and math.isfinite(value)
 
 
 def _is_int(value: Any) -> bool:

tests/test_strategy_spec_validation.py

@@ -284,6 +284,15 @@ def test_optimization_spec_rejects_schema_invalid_optional_parameter_fields_and_
     assert "promotion.max_fractional_kelly must be a number in (0, 1)" in issues
 
 
+def test_optimization_spec_handles_huge_json_integers_without_crashing() -> None:
+    payload = _optimization_spec()
+    promotion = payload["promotion"]
+    assert isinstance(promotion, dict)
+    promotion["max_fractional_kelly"] = 10**1000
+
+    assert "promotion.max_fractional_kelly must be a number in (0, 1)" in validate_optimization_spec(payload)
+
+
 def test_file_and_cli_validation_are_evidence_gate_friendly(tmp_path: Path) -> None:
     valid_path = tmp_path / "research-spec.json"
     valid_path.write_text(json.dumps(_research_spec()), encoding="utf-8")