diff --git a/controllers/llguidance_ctrl/run_g.py b/controllers/llguidance_ctrl/run_g.py
index 5f054293..c4483098 100644
--- a/controllers/llguidance_ctrl/run_g.py
+++ b/controllers/llguidance_ctrl/run_g.py
@@ -266,9 +266,19 @@ def character_maker2(lm, id, description, valid_weapons):
     assert grm.match("null")
 
     grm = guidance.json(
-        schema={"type": "object", "properties": {"a": {"type": "integer"}}}
+        "OBJ",
+        schema={
+            "type": "object",
+            "additionalProperties": False,
+            "properties": {"age": {"type": "integer"}},
+        }
     )
-    assert grm.match('{"a": 1}')
+    # assert grm.match('{"a": 1}')
+    prompt = ""
+    grm = "Here's some JSON:\n" + grm  # + "\nAnd some more:\n" + grm
+
+    # g = zero_or_more("a") + "b"
+    # assert not g.match("b")
 
     max_tokens = 250
 
@@ -282,6 +292,9 @@ def character_maker2(lm, id, description, valid_weapons):
     print("JSON size:", len(llguidance_arg), "saved to tmp/llguidance_arg.json")
     # print(json.dumps(llguidance_json, indent=2))
 
+    # with open("tmp/long_json_grammar_req.json", "r") as f:
+    #     llguidance_arg = f.read()
+
     # read current script file
     # with open(__file__) as f:
     #     script = f.read()
diff --git a/controllers/llguidance_ctrl/src/tokenparser.rs b/controllers/llguidance_ctrl/src/tokenparser.rs
index 7dcb3322..db8b13b1 100644
--- a/controllers/llguidance_ctrl/src/tokenparser.rs
+++ b/controllers/llguidance_ctrl/src/tokenparser.rs
@@ -114,7 +114,9 @@ impl TokenParser {
         idx += self.grm_prefix.len();
         let endp = std::cmp::min(
             self.llm_bytes.len(),
-            self.previous_grm_bytes.len() + self.parser.hidden_start(),
+            self.previous_grm_bytes
+                .len()
+                .saturating_add(self.parser.hidden_start()),
         );
         if idx >= self.llm_bytes.len() || idx >= endp {
             return &[];
diff --git a/py/llguidance/pyproject.toml b/py/llguidance/pyproject.toml
index 380e42ad..db3e2153 100644
--- a/py/llguidance/pyproject.toml
+++ b/py/llguidance/pyproject.toml
@@ -17,4 +17,5 @@ find = { where = ["python"] }
 target = "llguidance._lib"
 binding = "PyO3"
 debug = false
+# features = ["aici_llguidance_ctrl/logging"]
 # See reference for RustExtension in https://setuptools-rust.readthedocs.io/en/latest/reference.html