feature: add UiField as the new intermediate object representing wi…

…dget parameters (#475)

* wip

* tests working

* more bugs and tests

* remove notes file

* remove typemap2

* fix docs and types

* add another test

* update doc

* move sentinel

* docstring

* undo change in signature

* reduce code

* wip: starting on schema

* make func

* fix py3.8

* improving compat

* tests passing (cheating)

* fill out UiField func

* star

* playing with GUIField

* wip

* wip

* wip

* feat: support annotated types

* fix merge

* starting on create method

* wip

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix tests

* cleanup a bit

* refactor: make uifield generic

* misc

* minimize test

* add values and more annotations support

* refactor: rename file

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

magicgui/_type_resolution.py

@@ -4,7 +4,10 @@
 from copy import copy
 from functools import lru_cache, partial
 from importlib import import_module
-from typing import Any, Callable, Dict, Optional, Tuple, Type, Union, get_type_hints
+from typing import Any, Callable, Dict, Optional, Tuple, Type, Union
+
+# required for python 3.8 to strip annotations
+from typing_extensions import get_type_hints
 
 try:
     from toolz import curry
@@ -53,7 +56,7 @@ def resolve_types(
     obj = _unwrap_partial(obj)
 
     try:
-        hints = get_type_hints(obj, globalns=globalns, localns=localns)
+        hints = get_type_hints(obj, globalns=globalns, localns=localns)  # type: ignore
     except NameError as e:
         if do_imports:
             # try to import the top level name and try again
@@ -106,7 +109,7 @@ def resolve_single_type(
     return hints["obj"]
 
 
-_cached_resolve = lru_cache(maxsize=1)(resolve_single_type)
+_cached_resolve = lru_cache(maxsize=None)(resolve_single_type)
 
 
 def _try_cached_resolve(v):