diff --git a/parser/compositions.py b/parser/compositions.py
index 9135b83..22831af 100644
--- a/parser/compositions.py
+++ b/parser/compositions.py
@@ -497,6 +497,7 @@ def attach_compositions(idl, sql_src):
 
 
 _CAST_CALL = re.compile(r"^\s*(\w+)\s*\(\s*(\w+)\s*\)\s*$")
+_C_LITERAL = re.compile(r"^(?:true|false|-?\d+(?:\.\d+)?)$")
 
 
 def attach_wrapper_compositions(idl, mdb_src, sql_src, meos_src):
@@ -514,7 +515,9 @@ def attach_wrapper_compositions(idl, mdb_src, sql_src, meos_src):
     body cannot reach. Each signature is traced to the wrapper whose CREATE FUNCTION
     states it (#_signature_wrapper of parser/boundargs.py) and each argument of the call to
     the SQL argument it carries (#_caller_index); a cast is a public catalog function of
-    one parameter. A signature whose wrapper casts nothing stays where it is."""
+    one parameter. A C literal the wrapper passes, as ``true`` for the ``spheroid`` of
+    ``edwithin_tgeo_geo``, is a value operand. A signature whose wrapper casts nothing
+    stays where it is."""
     from parser.boundargs import (_call_args, _caller_index, _signature_wrapper,
                                   extract_wrappers)
     from parser.sqlfn import _meos_to_mdb, _wrapper_sql_sigs
@@ -545,13 +548,15 @@ def attach_wrapper_compositions(idl, mdb_src, sql_src, meos_src):
                         r"(?<![\w.>])" + re.escape(a) + r"\s*=(?!=)\s*([^;]+);", body)]
                     hit = _CAST_CALL.match(rhs[0]) if len(rhs) == 1 else None
                     cast = hit.group(1) if hit else None
-                    if cast in public and len(public[cast].get("params") or ()) == 1:
+                    if _C_LITERAL.match(a):
+                        operands.append({"value": a, "param": p})
+                    elif cast in public and len(public[cast].get("params") or ()) == 1:
                         operands.append({"arg": _caller_index(body, hit.group(2)),
                                          "casts": [cast], "param": p})
                         cast_seen = True
                     else:
                         operands.append({"arg": _caller_index(body, a), "param": p})
-                if not cast_seen or any(o["arg"] is None for o in operands):
+                if not cast_seen or any("arg" in o and o["arg"] is None for o in operands):
                     operands = None
             if operands is None:
                 keep.append(sig)
diff --git a/tests/test_compositions.py b/tests/test_compositions.py
index 8035f5f..7eb79b0 100644
--- a/tests/test_compositions.py
+++ b/tests/test_compositions.py
@@ -334,6 +334,18 @@ def test_a_cast_no_create_cast_declares_stops_the_catalog(self):
   int result = eintersects_tgeo_geo(temp, gs);
   PG_RETURN_BOOL(result ? true : false);
 }
+
+Datum
+Edwithin_tpose_geo(PG_FUNCTION_ARGS)
+{
+  Temporal *temp = PG_GETARG_TEMPORAL_P(0);
+  GSERIALIZED *gs = PG_GETARG_GSERIALIZED_P(1);
+  double dist = PG_GETARG_FLOAT8(2);
+  Temporal *tpoint = tpose_to_tpoint(temp);
+  int result = edwithin_tgeo_geo(tpoint, gs, dist, true);
+  pfree(tpoint);
+  PG_RETURN_BOOL(result ? true : false);
+}
 '''
 
 CAST_SQL = '''
@@ -347,6 +359,11 @@ def test_a_cast_no_create_cast_declares_stops_the_catalog(self):
   AS 'MODULE_PATHNAME', 'Eintersects_tgeo_geo'
   SUPPORT tspatial_supportfn
   LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
+CREATE FUNCTION eDwithin(tpose, geometry, float)
+  RETURNS boolean
+  AS 'MODULE_PATHNAME', 'Edwithin_tpose_geo'
+  SUPPORT tspatial_supportfn
+  LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 '''
 
 CAST_MEOS = '''
@@ -359,6 +376,17 @@ def test_a_cast_no_create_cast_declares_stops_the_catalog(self):
 {
   return 0;
 }
+
+/**
+ * @brief Return 1 if a temporal geo is ever within a distance of a geometry
+ * @csqlfn #Edwithin_tpose_geo()
+ */
+int
+edwithin_tgeo_geo(const Temporal *temp, const GSERIALIZED *gs, double dist,
+  bool spheroid)
+{
+  return 0;
+}
 '''
 
 
@@ -386,20 +414,32 @@ def _attach(self):
              "sqlSignatures": [{"args": ["tgeompoint", "geometry"], "ret": "boolean"},
                                {"args": ["tpose", "geometry"], "ret": "boolean"}]},
             {"name": "tpose_to_tpoint", "api": "public", "params": [{"name": "temp"}],
-             "sqlSignatures": []}],
+             "sqlSignatures": []},
+            {"name": "edwithin_tgeo_geo", "api": "public", "sqlfn": "eDwithin",
+             "params": [{"name": "temp"}, {"name": "gs"}, {"name": "dist"},
+                        {"name": "spheroid"}],
+             "sqlSignatures": [{"args": ["tpose", "geometry", "float"], "ret": "boolean"}]}],
             "compositions": []}
         return attach_wrapper_compositions(idl, root / "src", root / "sql", root / "meos")
 
     def test_the_cast_wrapper_states_a_composition(self):
         idl, n = self._attach()
-        self.assertEqual(n, 1)
-        self.assertEqual(idl["compositions"], [{
+        self.assertEqual(n, 2)
+        self.assertEqual(idl["compositions"][:1], [{
             "sqlName": "eIntersects", "args": ["tpose", "geometry"], "required": 2,
             "argDefaults": [None, None], "ret": "boolean",
             "operands": [{"arg": 0, "casts": ["tpose_to_tpoint"], "param": "temp"},
                          {"arg": 1, "param": "gs"}],
             "call": "eintersects_tgeo_geo"}])
 
+    def test_a_literal_argument_is_a_value_operand(self):
+        idl, _ = self._attach()
+        self.assertEqual(idl["compositions"][1]["operands"], [
+            {"arg": 0, "casts": ["tpose_to_tpoint"], "param": "temp"},
+            {"arg": 1, "param": "gs"}, {"arg": 2, "param": "dist"},
+            {"value": "true", "param": "spheroid"}])
+        self.assertEqual(idl["functions"][2]["sqlSignatures"], [])
+
     def test_the_wrapper_casting_nothing_keeps_its_signature(self):
         idl, _ = self._attach()
         self.assertEqual([s["args"] for s in idl["functions"][0]["sqlSignatures"]],