Deal with a type issue (and solve another)

python/mypy#13627 now causes spurious errors
involving numpy but another type issue is solved.

Author: calpaterson

csvbase/web.py

@@ -1087,10 +1087,7 @@ def byte_buf_to_str_buf(byte_buf: UserSubmittedBytes) -> codecs.StreamReader:
         logger.warning("unable to detect charset, assuming utf-8")
         encoding = "utf-8"
     Reader = codecs.getreader(encoding)
-    # FIXME: the issue here seems to be that StreamReader is typed to want
-    # specifically an IO[bytes] but will actually work with other things that
-    # are file-like enough
-    return Reader(byte_buf)  # type: ignore
+    return Reader(byte_buf)
 
 
 def set_current_user_for_session(user: User, session: Optional[Any] = None) -> None:

mypy.ini

@@ -1,5 +1,8 @@
 [mypy]
-python_version = 3.7
+# work around https://github.com/python/mypy/issues/13627
+# (3.7 would be preferred)
+python_version = 3.8
+
 plugins = sqlmypy
 check_untyped_defs = True
 no_implicit_optional = True

setup.py

@@ -8,7 +8,7 @@
     "black==22.3.0",
     "bpython~=0.22.1",
     "feedparser==6.0.2",
-    "mypy==0.910",
+    "mypy==0.982",
     "pandas==1.3.5",
     "pytest-flask==1.2.0",
     "pytest==7.1.1",