tweak to ensure machinery matches with emmet

Author: esoteric-ephemera

pymatgen/io/validation/common.py

@@ -9,7 +9,16 @@
 from monty.serialization import loadfn
 import os
 from pathlib import Path
-from pydantic import BaseModel, Field, model_validator, model_serializer, PrivateAttr, PlainSerializer, BeforeValidator
+from pydantic import (
+    BaseModel,
+    Field,
+    model_validator,
+    model_serializer,
+    PrivateAttr,
+    PlainSerializer,
+    BeforeValidator,
+    RootModel,
+)
 from typing import TYPE_CHECKING, Any, Annotated, TypeAlias
 
 from pymatgen.core import Structure
@@ -54,6 +63,14 @@ def _msonable_from_str(obj: Any, cls: type[MSONable]) -> MSONable:
 ]
 
 
+class _MsonStrType(RootModel):
+    root: str
+
+
+for pmg_obj in (Incar, Kpoints, Structure):
+    setattr(pmg_obj, "__type_adapter__", _MsonStrType)
+
+
 class ValidationError(Exception):
     """Define custom exception during validation."""