diff --git a/midas/checker/builtins.py b/midas/checker/builtins.py
index 7bf1d98..daf0015 100644
--- a/midas/checker/builtins.py
+++ b/midas/checker/builtins.py
@@ -15,6 +15,7 @@ if TYPE_CHECKING:
 
 
 BUILTIN_SUBTYPES: dict[str, set[str]] = {
+    "object": {"float", "list", "dict"},
     "float": {"int"},
     "int": {"bool"},
 }
diff --git a/midas/checker/midas.py b/midas/checker/midas.py
index 1fe1490..750fb02 100644
--- a/midas/checker/midas.py
+++ b/midas/checker/midas.py
@@ -224,9 +224,9 @@ class MidasTyper(m.Stmt.Visitor[None], m.Expr.Visitor[Type], m.Type.Visitor[Type
     def visit_binary_expr(self, expr: m.BinaryExpr) -> Type:
         method: Optional[str] = MIDAS_BINARY_METHODS.get(expr.operator.type)
         if method is None:
-            self.logger.warning(f"Unsupported operator {expr.operator}")
+            self.logger.warning(f"Unsupported operator {expr.operator.lexeme}")
             self.reporter.warning(
-                expr.location, f"Unsupported operator {expr.operator}"
+                expr.location, f"Unsupported operator {expr.operator.lexeme}"
             )
             return UnknownType()
 
@@ -257,9 +257,9 @@ class MidasTyper(m.Stmt.Visitor[None], m.Expr.Visitor[Type], m.Type.Visitor[Type
     def visit_unary_expr(self, expr: m.UnaryExpr) -> Type:
         method: Optional[str] = MIDAS_UNARY_METHODS.get(expr.operator.type)
         if method is None:
-            self.logger.warning(f"Unsupported operator {expr.operator}")
+            self.logger.warning(f"Unsupported operator {expr.operator.lexeme}")
             self.reporter.warning(
-                expr.location, f"Unsupported operator {expr.operator}"
+                expr.location, f"Unsupported operator {expr.operator.lexeme}"
             )
             return UnknownType()
 
@@ -303,7 +303,7 @@ class MidasTyper(m.Stmt.Visitor[None], m.Expr.Visitor[Type], m.Type.Visitor[Type
         member: Optional[Type] = self.types.lookup_member(object, expr.name.lexeme)
         if member is None:
             self.reporter.error(
-                expr.location, f"Unknown member '{expr.name}' of {object}"
+                expr.location, f"Unknown member '{expr.name.lexeme}' of {object}"
             )
             return UnknownType()
         return member
diff --git a/midas/checker/operators.py b/midas/checker/operators.py
index 60b8b25..f9354a0 100644
--- a/midas/checker/operators.py
+++ b/midas/checker/operators.py
@@ -21,7 +21,7 @@ PY_OPERATOR_METHODS: dict[Type[ast.operator], str] = {
 
 PY_COMPARATOR_METHODS: dict[Type[ast.cmpop], str] = {
     ast.Eq: "__eq__",
-    # ast.NotEq: "__noteq__",
+    ast.NotEq: "__eq__",
     ast.Lt: "__lt__",
     ast.LtE: "__le__",
     ast.Gt: "__gt__",
@@ -52,7 +52,7 @@ MIDAS_BINARY_METHODS: dict[TokenType, str] = {
     # ast.BitAnd: "__and__",
     # ast.FloorDiv: "__floordiv__",
     TokenType.EQUAL_EQUAL: "__eq__",
-    # ast.NotEq: "__noteq__",
+    TokenType.BANG_EQUAL: "__eq__",
     TokenType.LESS: "__lt__",
     TokenType.LESS_EQUAL: "__le__",
     TokenType.GREATER: "__gt__",