Revive ValueEnum.as_dict method (#974)

* Revive ValueEnum.as_dict method

* linting

emmet-core/emmet/core/utils.py

@@ -286,7 +286,13 @@ def jsanitize(obj, strict=False, allow_bson=False):
 
 class ValueEnum(Enum):
     """
-    Enum that serializes to string as the value
+    Enum that serializes to string as the value.
+
+    While this method has an `as_dict` method, this
+    returns a `str`. This is to ensure deserialization
+    to a `str` when functions like `monty.json.jsanitize`
+    are called on a ValueEnum with `strict = True` and
+    `enum_values = False` (occurs often in jobflow).
     """
 
     def __str__(self):
@@ -304,6 +310,10 @@ def __hash__(self):
         """Get a hash of the enum."""
         return hash(str(self))
 
+    def as_dict(self) -> str:
+        """Deserialize in a kludgey way."""
+        return self.__str__()
+
 
 class DocEnum(ValueEnum):
     """

emmet-core/tests/test_utils.py

@@ -77,9 +77,14 @@ class TempEnum(ValueEnum):
 
     assert str(TempEnum.A) == "A"
     assert str(TempEnum.B) == "B"
+
     dumpfn(TempEnum, tmp_path / "temp.json")
     assert Path(tmp_path, "temp.json").is_file()
 
+    # ensure that as_dict method yields str
+    assert hasattr(TempEnum, "as_dict")
+    assert all(isinstance(val.as_dict(), str) for val in TempEnum)
+
 
 def test_doc_enum():
     class TestEnum(DocEnum):