diff --git a/stdlib/3/builtins.pyi b/stdlib/3/builtins.pyi
index 952cb3dec..3c82247a6 100644
--- a/stdlib/3/builtins.pyi
+++ b/stdlib/3/builtins.pyi
@@ -299,14 +299,23 @@ class bytes(ByteString):
     def __init__(self, o: SupportsBytes) -> None: ...
     def capitalize(self) -> bytes: ...
     def center(self, width: int, fillchar: bytes = ...) -> bytes: ...
-    def count(self, x: bytes) -> int: ...
+    if sys.version_info >= (3, 3):
+        def count(self, sub: Union[bytes, int], start: int = None, end: int = None) -> int: ...
+    else:
+        def count(self, sub: bytes, start: int = None, end: int = None) -> int: ...
     def decode(self, encoding: str = 'utf-8', errors: str = 'strict') -> str: ...
     def endswith(self, suffix: Union[bytes, Tuple[bytes, ...]]) -> bool: ...
     def expandtabs(self, tabsize: int = 8) -> bytes: ...
-    def find(self, sub: bytes, start: int = 0, end: int = 0) -> int: ...
+    if sys.version_info >= (3, 3):
+        def find(self, sub: Union[bytes, int], start: int = None, end: int = None) -> int: ...
+    else:
+        def find(self, sub: bytes, start: int = None, end: int = None) -> int: ...
     if sys.version_info >= (3, 5):
         def hex(self) -> str: ...
-    def index(self, sub: bytes, start: int = 0, end: int = 0) -> int: ...
+    if sys.version_info >= (3, 3):
+        def index(self, sub: Union[bytes, int], start: int = None, end: int = None) -> int: ...
+    else:
+        def index(self, sub: bytes, start: int = None, end: int = None) -> int: ...
     def isalnum(self) -> bool: ...
     def isalpha(self) -> bool: ...
     def isdigit(self) -> bool: ...
@@ -320,8 +329,14 @@ class bytes(ByteString):
     def lstrip(self, chars: bytes = None) -> bytes: ...
     def partition(self, sep: bytes) -> Tuple[bytes, bytes, bytes]: ...
     def replace(self, old: bytes, new: bytes, count: int = -1) -> bytes: ...
-    def rfind(self, sub: bytes, start: int = 0, end: int = 0) -> int: ...
-    def rindex(self, sub: bytes, start: int = 0, end: int = 0) -> int: ...
+    if sys.version_info >= (3, 3):
+        def rfind(self, sub: Union[bytes, int], start: int = None, end: int = None) -> int: ...
+    else:
+        def rfind(self, sub: bytes, start: int = None, end: int = None) -> int: ...
+    if sys.version_info >= (3, 3):
+        def rindex(self, sub: Union[bytes, int], start: int = None, end: int = None) -> int: ...
+    else:
+        def rindex(self, sub: bytes, start: int = None, end: int = None) -> int: ...
     def rjust(self, width: int, fillchar: bytes = ...) -> bytes: ...
     def rpartition(self, sep: bytes) -> Tuple[bytes, bytes, bytes]: ...
     def rsplit(self, sep: bytes = None, maxsplit: int = -1) -> List[bytes]: ...
@@ -373,14 +388,23 @@ class bytearray(MutableSequence[int], ByteString):
     def __init__(self) -> None: ...
     def capitalize(self) -> bytearray: ...
     def center(self, width: int, fillchar: bytes = ...) -> bytearray: ...
-    def count(self, x: bytes) -> int: ...
+    if sys.version_info >= (3, 3):
+        def count(self, sub: Union[bytes, int], start: int = None, end: int = None) -> int: ...
+    else:
+        def count(self, sub: bytes, start: int = None, end: int = None) -> int: ...
     def decode(self, encoding: str = 'utf-8', errors: str = 'strict') -> str: ...
     def endswith(self, suffix: bytes) -> bool: ...
     def expandtabs(self, tabsize: int = 8) -> bytearray: ...
-    def find(self, sub: bytes, start: int = 0, end: int = 0) -> int: ...
+    if sys.version_info >= (3, 3):
+        def find(self, sub: Union[bytes, int], start: int = None, end: int = None) -> int: ...
+    else:
+        def find(self, sub: bytes, start: int = None, end: int = None) -> int: ...
     if sys.version_info >= (3, 5):
         def hex(self) -> str: ...
-    def index(self, sub: bytes, start: int = 0, end: int = 0) -> int: ...
+    if sys.version_info >= (3, 3):
+        def index(self, sub: Union[bytes, int], start: int = None, end: int = None) -> int: ...
+    else:
+        def index(self, sub: bytes, start: int = None, end: int = None) -> int: ...
     def insert(self, index: int, object: int) -> None: ...
     def isalnum(self) -> bool: ...
     def isalpha(self) -> bool: ...
@@ -395,8 +419,14 @@ class bytearray(MutableSequence[int], ByteString):
     def lstrip(self, chars: bytes = None) -> bytearray: ...
     def partition(self, sep: bytes) -> Tuple[bytearray, bytearray, bytearray]: ...
     def replace(self, old: bytes, new: bytes, count: int = -1) -> bytearray: ...
-    def rfind(self, sub: bytes, start: int = 0, end: int = 0) -> int: ...
-    def rindex(self, sub: bytes, start: int = 0, end: int = 0) -> int: ...
+    if sys.version_info >= (3, 3):
+        def rfind(self, sub: Union[bytes, int], start: int = None, end: int = None) -> int: ...
+    else:
+        def rfind(self, sub: bytes, start: int = None, end: int = None) -> int: ...
+    if sys.version_info >= (3, 3):
+        def rindex(self, sub: Union[bytes, int], start: int = None, end: int = None) -> int: ...
+    else:
+        def rindex(self, sub: bytes, start: int = None, end: int = None) -> int: ...
     def rjust(self, width: int, fillchar: bytes = ...) -> bytearray: ...
     def rpartition(self, sep: bytes) -> Tuple[bytearray, bytearray, bytearray]: ...
     def rsplit(self, sep: bytes = None, maxsplit: int = -1) -> List[bytearray]: ...