[0.930 backport] update curses stubs

To help with #11768

We'll also need to cherry pick #11781

mypy/typeshed/stdlib/_curses.pyi

@@ -1,5 +1,6 @@
 import sys
-from typing import IO, Any, BinaryIO, NamedTuple, Union, overload
+from _typeshed import SupportsRead
+from typing import IO, Any, NamedTuple, Union, overload
 
 _chtype = Union[str, bytes, int]
 
@@ -293,9 +294,14 @@ def erasechar() -> bytes: ...
 def filter() -> None: ...
 def flash() -> None: ...
 def flushinp() -> None: ...
+
+if sys.version_info >= (3, 9):
+    def get_escdelay() -> int: ...
+    def get_tabsize() -> int: ...
+
 def getmouse() -> tuple[int, int, int, int, int]: ...
 def getsyx() -> tuple[int, int]: ...
-def getwin(__file: BinaryIO) -> _CursesWindow: ...
+def getwin(__file: SupportsRead[bytes]) -> _CursesWindow: ...
 def halfdelay(__tenths: int) -> None: ...
 def has_colors() -> bool: ...
 
@@ -337,14 +343,19 @@ def resetty() -> None: ...
 def resize_term(__nlines: int, __ncols: int) -> None: ...
 def resizeterm(__nlines: int, __ncols: int) -> None: ...
 def savetty() -> None: ...
+
+if sys.version_info >= (3, 9):
+    def set_escdelay(__ms: int) -> None: ...
+    def set_tabsize(__size: int) -> None: ...
+
 def setsyx(__y: int, __x: int) -> None: ...
 def setupterm(term: str | None = ..., fd: int = ...) -> None: ...
 def start_color() -> None: ...
 def termattrs() -> int: ...
 def termname() -> bytes: ...
 def tigetflag(__capname: str) -> int: ...
 def tigetnum(__capname: str) -> int: ...
-def tigetstr(__capname: str) -> bytes: ...
+def tigetstr(__capname: str) -> bytes | None: ...
 def tparm(
     __str: bytes,
     __i1: int = ...,
@@ -362,7 +373,7 @@ def unctrl(__ch: _chtype) -> bytes: ...
 def unget_wch(__ch: int | str) -> None: ...
 def ungetch(__ch: _chtype) -> None: ...
 def ungetmouse(__id: int, __x: int, __y: int, __z: int, __bstate: int) -> None: ...
-def update_lines_cols() -> int: ...
+def update_lines_cols() -> None: ...
 def use_default_colors() -> None: ...
 def use_env(__flag: bool) -> None: ...
 
@@ -444,13 +455,13 @@ class _CursesWindow:
     def getmaxyx(self) -> tuple[int, int]: ...
     def getparyx(self) -> tuple[int, int]: ...
     @overload
-    def getstr(self) -> _chtype: ...
+    def getstr(self) -> bytes: ...
     @overload
-    def getstr(self, n: int) -> _chtype: ...
+    def getstr(self, n: int) -> bytes: ...
     @overload
-    def getstr(self, y: int, x: int) -> _chtype: ...
+    def getstr(self, y: int, x: int) -> bytes: ...
     @overload
-    def getstr(self, y: int, x: int, n: int) -> _chtype: ...
+    def getstr(self, y: int, x: int, n: int) -> bytes: ...
     def getyx(self) -> tuple[int, int]: ...
     @overload
     def hline(self, ch: _chtype, n: int) -> None: ...
@@ -460,9 +471,9 @@ class _CursesWindow:
     def idlok(self, yes: bool) -> None: ...
     def immedok(self, flag: bool) -> None: ...
     @overload
-    def inch(self) -> _chtype: ...
+    def inch(self) -> int: ...
     @overload
-    def inch(self, y: int, x: int) -> _chtype: ...
+    def inch(self, y: int, x: int) -> int: ...
     @overload
     def insch(self, ch: _chtype, attr: int = ...) -> None: ...
     @overload
@@ -478,9 +489,9 @@ class _CursesWindow:
     @overload
     def insstr(self, y: int, x: int, str: str, attr: int = ...) -> None: ...
     @overload
-    def instr(self, n: int = ...) -> _chtype: ...
+    def instr(self, n: int = ...) -> bytes: ...
     @overload
-    def instr(self, y: int, x: int, n: int = ...) -> _chtype: ...
+    def instr(self, y: int, x: int, n: int = ...) -> bytes: ...
     def is_linetouched(self, __line: int) -> bool: ...
     def is_wintouched(self) -> bool: ...
     def keypad(self, yes: bool) -> None: ...