diff --git a/pybind/AE.cpp b/pybind/AE.cpp
index d79d181..3c899e3 100644
--- a/pybind/AE.cpp
+++ b/pybind/AE.cpp
@@ -163,11 +163,11 @@ void bind_abstract_state(py::module& m) {
         .def("is_int", &IntervalValue::is_int)
         .def("equals", &IntervalValue::equals, py::arg("other"))
         .def("eq_interval", [](const IntervalValue &self, const IntervalValue &other) {
-                return self.operator==(other);
-            }, py::arg("other"))
+            return self.operator==(other);
+        }, py::arg("other"))
         .def("ne_interval", [](const IntervalValue &self, const IntervalValue &other) {
-                return self.operator!=(other);
-            }, py::arg("other"))
+            return self.operator!=(other);
+        }, py::arg("other"))
         .def("getNumeral", &IntervalValue::getNumeral)
         .def("getIntNumeral", &IntervalValue::getIntNumeral)
         .def("getRealNumeral", &IntervalValue::getRealNumeral)
@@ -394,7 +394,7 @@ void bind_abstract_state(py::module& m) {
         .def("printAbstractState", &AbstractState::printAbstractState)
         .def("clone", [](const AbstractState &self) {
             return std::make_unique<AbstractState>(self);  // clone
-         }, py::return_value_policy::move)
+        }, py::return_value_policy::move)
         .def("bottom", &AbstractState::bottom)
         .def("top", &AbstractState::top)
         .def("inVarToValTable", &AbstractState::inVarToValTable, py::arg("var_id"))
diff --git a/pysvf/__init__.py b/pysvf/__init__.py
index 246367b..e20a55f 100644
--- a/pysvf/__init__.py
+++ b/pysvf/__init__.py
@@ -88,7 +88,7 @@ def main():
     args = sys.argv[2:]
     run_svf_tool(tool_name, args)
 
-from .enums import Predicate, OpCode
+from .enums import Predicate, OpCode, CopyKind
 # Import all the module classes and functions
 from .pysvf import (
     releasePAG,
diff --git a/pysvf/enums.py b/pysvf/enums.py
index 8c144c7..e8706d3 100644
--- a/pysvf/enums.py
+++ b/pysvf/enums.py
@@ -67,4 +67,21 @@ class PTAType(IntEnum):
     """Pointer Analysis Types"""
 
     Andersen = 0        # Andersen's analysis
-    Steensgaard = 1     # Steensgaard's analysis
\ No newline at end of file
+    Steensgaard = 1     # Steensgaard's analysis
+
+
+class CopyKind(IntEnum):
+    """Copy kinds for CopyStmt (mirrors SVF::CopyStmt::CopyKind)"""
+
+    COPYVAL = 0         # Value copies (default one)
+    ZEXT = 1            # Zero extend integers
+    SEXT = 2            # Sign extend integers
+    BITCAST = 3         # Type cast
+    TRUNC = 4           # Truncate integers
+    FPTRUNC = 5         # Truncate floating point
+    FPTOUI = 6          # floating point -> UInt
+    FPTOSI = 7          # floating point -> SInt
+    UITOFP = 8          # UInt -> floating point
+    SITOFP = 9          # SInt -> floating point
+    INTTOPTR = 10       # Integer -> Pointer
+    PTRTOINT = 11       # Pointer -> Integer
diff --git a/pysvf/pysvf.pyi b/pysvf/pysvf.pyi
index 8da22a4..10be21f 100644
--- a/pysvf/pysvf.pyi
+++ b/pysvf/pysvf.pyi
@@ -1846,16 +1846,18 @@ class IntervalValue:
     def __init__(self, lb: BoundedInt, ub: BoundedInt) -> None: ...
     @overload
     def __init__(self, val: int) -> None: ...
-    # `__eq__` and `__ne__`'s type annotations are forced as `bool` for all objects,
-    # use `type: ignore` so that equality operators in C++ and Python are the same
-    @overload
-    def __eq__(self, other: 'IntervalValue') -> 'IntervalValue': ... # type: ignore
-    @overload
-    def __eq__(self, other: object) -> bool: ...
-    @overload
-    def __ne__(self, other: 'IntervalValue') -> 'IntervalValue': ... # type: ignore
-    @overload
-    def __ne__(self, other: object) -> bool: ...
+    def __eq__(self, other: object) -> bool:
+        """
+        Alias for the C++ `IntervalValue::equals`. Python requires the equality operator
+        to return booleans.
+        """
+        ...
+    def __ne__(self, other: object) -> bool:
+        """
+        Alias for the C++ `!IntervalValue::equals`. Python requires the inequality operator
+        to return booleans.
+        """
+        ...
     def __add__(self, other: 'IntervalValue') -> 'IntervalValue': ...
     def __sub__(self, other: 'IntervalValue') -> 'IntervalValue': ...
     def __mul__(self, other: 'IntervalValue') -> 'IntervalValue': ...
@@ -1868,9 +1870,9 @@ class IntervalValue:
     def __and__(self, other: "IntervalValue") -> "IntervalValue": ...
     def __or__(self, other: "IntervalValue") -> "IntervalValue": ...
     def __xor__(self, other: "IntervalValue") -> "IntervalValue": ...
-    def __lshift__(self, bits: int) -> "IntervalValue": ...
-    def __rshift__(self, bits: int) -> "IntervalValue": ...
-    def equals(self, other: "IntervalValue") -> "IntervalValue": ...
+    def __lshift__(self, other: "IntervalValue") -> "IntervalValue": ...
+    def __rshift__(self, other: "IntervalValue") -> "IntervalValue": ...
+    def equals(self, other: "IntervalValue") -> bool: ...
     def lb(self) -> BoundedInt: ...
     def ub(self) -> BoundedInt: ...
     def clone(self) -> 'IntervalValue': ...
@@ -1894,8 +1896,12 @@ class IntervalValue:
     def set_to_bottom(self) -> None: ...
     def set_to_top(self) -> None: ...
     def toString(self) -> str: ...
-    def eq_interval(self, other: 'IntervalValue') -> 'IntervalValue': ...
-    def ne_interval(self, other: 'IntervalValue') -> 'IntervalValue': ...
+    def eq_interval(self, other: 'IntervalValue') -> 'IntervalValue':
+        """Alias for the C++ `IntervalValue::operator==`."""
+        ...
+    def ne_interval(self, other: 'IntervalValue') -> 'IntervalValue':
+        """Alias for the C++ `IntervalValue::operator!=`."""
+        ...
     @staticmethod
     def top() -> 'IntervalValue': ...
     @staticmethod
@@ -1978,8 +1984,6 @@ class AbstractState:
     def isVirtualMemAddress(val: int) -> bool: ...
     @staticmethod
     def getVirtualMemAddress(idx: int) -> int: ...
-    def isCmpBranchFeasible(self, cmp: 'CmpStmt', succ: int, abstract_state: AbstractState) -> bool: ...
-    def isSwitchBranchFeasible(self, switch_var: SVFVar, succ: int, abstract_state: AbstractState) -> bool: ...
     def inVarToValTable(self, var_id: int) -> bool: ...
     def inVarToAddrsTable(self, var_id: int) -> bool: ...
     def inAddrToAddrsTable(self, id: int) -> bool: ...