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>

stubs/regex/regex/_regex_core.pyi

@@ -9,40 +9,40 @@ class error(Exception):
     def __init__(self, message: str, pattern: AnyStr | None = None, pos: int | None = None) -> None: ...
 
 class RegexFlag(enum.IntFlag):
-    A: int
-    ASCII: int
-    B: int
-    BESTMATCH: int
-    D: int
-    DEBUG: int
-    E: int
-    ENHANCEMATCH: int
-    F: int
-    FULLCASE: int
-    I: int
-    IGNORECASE: int
-    L: int
-    LOCALE: int
-    M: int
-    MULTILINE: int
-    P: int
-    POSIX: int
-    R: int
-    REVERSE: int
-    T: int
-    TEMPLATE: int
-    S: int
-    DOTALL: int
-    U: int
-    UNICODE: int
-    V0: int
-    VERSION0: int
-    V1: int
-    VERSION1: int
-    W: int
-    WORD: int
-    X: int
-    VERBOSE: int
+    A = 0x80
+    ASCII = A
+    B = 0x1000
+    BESTMATCH = B
+    D = 0x200
+    DEBUG = D
+    E = 0x8000
+    ENHANCEMATCH = E
+    F = 0x4000
+    FULLCASE = F
+    I = 0x2
+    IGNORECASE = I
+    L = 0x4
+    LOCALE = L
+    M = 0x8
+    MULTILINE = M
+    P = 0x10000
+    POSIX = P
+    R = 0x400
+    REVERSE = R
+    T = 0x1
+    TEMPLATE = T
+    S = 0x10
+    DOTALL = S
+    U = 0x20
+    UNICODE = U
+    V0 = 0x2000
+    VERSION0 = V0
+    V1 = 0x100
+    VERSION1 = V1
+    W = 0x800
+    WORD = W
+    X = 0x40
+    VERBOSE = X
 
 A: int
 ASCII: int