There were two problems AFAICT:
- There are multiple Loader classes without a common base class,
so this should really be a union or a protocol.
- The argument is supposed to be a class, not an instance.
Rather than figuring out a fix (which would probably require some
nasty refactoring) I'm just going back to the old situation where
these arguments are implicitly annotated with `Any`.
See also https://github.com/python/typeshed/pull/1657#pullrequestreview-72049880
Currently, the type definition for `JSONAttribute` assumes the deserialized value will be a `dict`. However, a `list` is also a valid `JSONAttribute` (its [deserialize](495eae2867/pynamodb/attributes.py (L418)) method just calls `json.loads`.
* Add Protocol and runtime to typing_extensions
* Use private type variable
* Fix typo
* Bound type variable for runtime to only class objects
* Conform to version check specification
* Add flags to pass on --warn-unused-ignores and --no-implicit-optional to mypy
* Make implicit Optional explicit in arg types (2and3 part)
* Convert {stdlib,third_party}/2 to explicit Optional
* Update default values to `...` in `__init__` and `__new__` in `int` and `str`.
* Add `__new__` to `enum.IntEnum` to override inherited `__new__`.
* Add `type: ignore` comment to `IntEnum`
* Tweak Click 6.6 Decorator Type Stubs
- Add context_settings for command
- Make callback Callable type accept some more types
To address Issue 1238
* Update decorators.pyi
- Updates documentation related to previously required comment headers.
- Removes all comment headers from stubs
- Occasionally included a header for stubs that were noted to be incomplete or contained todo's.
* Allow None in concurrent.futures.exception() and set_exception()
* Make Executor.map() signature more precise
* Remove superfluous signatures
* Specify str type for some concurrent.futures constants
* Update concurrent.futures backport
* CR fixes
* add typing.ContextManager for 3.6+ only
This fixes the easier part of #655.
Would it make sense to add a generic typing.ContextManager that exists in any Python version?
* update comment
* fix argument types for ContextManager.__exit__
* add AsyncContextManager
* add @asynccontextmanager
* typing.ContextManager now always exists
* back out async-related changes
Will submit those in a separate PR later
* fix import order
* AbstractContextManager only exists in 3.6+
* AbstractContextManager -> ContextManager
* Add missing methods to Python 2 concurrent.futures
Future.exception_info() and Future.set_exception_info() are methods
present only in the Python 2 backport of concurrent.futures.
* Mark timeout args as optional
