Add precise values for enum members where possible (#11299)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Alex Waygood <alex.waygood@gmail.com>

stdlib/asyncio/constants.pyi

@@ -15,6 +15,6 @@ if sys.version_info >= (3, 12):
     THREAD_JOIN_TIMEOUT: Literal[300]
 
 class _SendfileMode(enum.Enum):
-    UNSUPPORTED: int
-    TRY_NATIVE: int
-    FALLBACK: int
+    UNSUPPORTED = 1
+    TRY_NATIVE = 2
+    FALLBACK = 3

stdlib/asyncio/locks.pyi

@@ -101,10 +101,10 @@ class BoundedSemaphore(Semaphore): ...
 
 if sys.version_info >= (3, 11):
     class _BarrierState(enum.Enum):  # undocumented
-        FILLING: str
-        DRAINING: str
-        RESETTING: str
-        BROKEN: str
+        FILLING = "filling"
+        DRAINING = "draining"
+        RESETTING = "resetting"
+        BROKEN = "broken"
 
     class Barrier(_LoopBoundMixin):
         def __init__(self, parties: int) -> None: ...

stdlib/asyncio/sslproto.pyi

@@ -14,17 +14,17 @@ if sys.version_info >= (3, 11):
     SSLAgainErrors: tuple[type[ssl.SSLWantReadError], type[ssl.SSLSyscallError]]
 
     class SSLProtocolState(Enum):
-        UNWRAPPED: str
-        DO_HANDSHAKE: str
-        WRAPPED: str
-        FLUSHING: str
-        SHUTDOWN: str
+        UNWRAPPED = "UNWRAPPED"
+        DO_HANDSHAKE = "DO_HANDSHAKE"
+        WRAPPED = "WRAPPED"
+        FLUSHING = "FLUSHING"
+        SHUTDOWN = "SHUTDOWN"
 
     class AppProtocolState(Enum):
-        STATE_INIT: str
-        STATE_CON_MADE: str
-        STATE_EOF: str
-        STATE_CON_LOST: str
+        STATE_INIT = "STATE_INIT"
+        STATE_CON_MADE = "STATE_CON_MADE"
+        STATE_EOF = "STATE_EOF"
+        STATE_CON_LOST = "STATE_CON_LOST"
 
     def add_flowcontrol_defaults(high: int | None, low: int | None, kb: int) -> tuple[int, int]: ...