Apply fixes, remove duplicates.

Apply fixes to _random, cStringIO, errno, operator, sys, zlib, etc.; also,
remove duplicate 2.7/math.pyi, 2.7/marshal.pyi.

builtins/2.7/unicodedata.pyi

@@ -1,37 +1,39 @@
-# Stubs for unicodedata (Python 2.7)
-#
-# NOTE: This dynamically typed stub was automatically generated by stubgen.
+"""Stubs for the 'unicodedata' module."""
 
-from typing import Any
+from typing import Any, TypeVar
 
-ucd_3_2_0 = ... # type: Any
-ucnhash_CAPI = ... # type: Any
+ucd_3_2_0 = ... # type: UCD
+ucnhash_CAPI = ... # type: Any (PyCapsule)
 unidata_version = ... # type: str
 
-def bidirectional(unichr): ...
-def category(unichr): ...
-def combining(unichr): ...
-def decimal(chr, default=...): ...
-def decomposition(unichr): ...
-def digit(chr, default=...): ...
-def east_asian_width(unichr): ...
-def lookup(name): ...
-def mirrored(unichr): ...
-def name(chr, default=...): ...
-def normalize(form: str, unistr: unicode) -> unicode: ...
-def numeric(chr, default=...): ...
+_default = TypeVar("default")
 
-class UCD:
-    unidata_version = ... # type: Any
-    def bidirectional(self, unichr): ...
-    def category(self, unichr): ...
-    def combining(self, unichr): ...
-    def decimal(self, chr, default=...): ...
-    def decomposition(self, unichr): ...
-    def digit(self, chr, default=...): ...
-    def east_asian_width(self, unichr): ...
-    def lookup(self, name): ...
-    def mirrored(self, unichr): ...
-    def name(self, chr, default=...): ...
-    def normalize(self, form, unistr): ...
-    def numeric(self, chr, default=...): ...
+def bidirectional(unichr: unicode) -> str: ...
+def category(unichr: unicode) -> str: ...
+def combining(unichr: unicode) -> int: ...
+def decimal(chr: unicode, default=_default) -> Union[int, _default]: ...
+def decomposition(unichr: unicode) -> str: ...
+def digit(chr: unicode, default=_default) -> Union[int, _default]: ...
+def east_asian_width(unichr: unicode): str
+def lookup(name: str): unicode
+def mirrored(unichr: unicode): int
+def name(chr: unicode, default=_default) -> Union[str, _default]: ...
+def normalize(form: str, unistr: unicode) -> unicode: ...
+def numeric(chr, default=_default): Union[float, _default]: ...
+
+class UCD(object):
+    unidata_version = ... # type: str
+    # The methods below are constructed from the same array in C
+    # (unicodedata_functions) and hence identical to the methods above.
+    def bidirectional(unichr: unicode) -> str: ...
+    def category(unichr: unicode) -> str: ...
+    def combining(unichr: unicode) -> int: ...
+    def decimal(chr: unicode, default=_default) -> Union[int, _default]: ...
+    def decomposition(unichr: unicode) -> str: ...
+    def digit(chr: unicode, default=_default) -> Union[int, _default]: ...
+    def east_asian_width(unichr: unicode): str
+    def lookup(name: str): unicode
+    def mirrored(unichr: unicode): int
+    def name(chr: unicode, default=_default) -> Union[str, _default]: ...
+    def normalize(form: str, unistr: unicode) -> unicode: ...
+    def numeric(chr, default=_default): Union[float, _default]: ...