diff --git a/flama/background.py b/flama/background.py
index a5305649..5df2f609 100644
--- a/flama/background.py
+++ b/flama/background.py
@@ -31,7 +31,7 @@ def __init__(
         self.func = self._create_task_function(func)
         self.args = args
         self.kwargs = kwargs
-        self.concurrency = Concurrency(concurrency)
+        self.concurrency = Concurrency[concurrency] if isinstance(concurrency, str) else concurrency
 
     def _create_task_function(self, func: t.Callable[P, t.Any]) -> t.Callable[P, t.Any]:
         if asyncio.iscoroutinefunction(func):
diff --git a/flama/serialize/__init__.py b/flama/serialize/__init__.py
index 4c560bd7..6cc9cae1 100644
--- a/flama/serialize/__init__.py
+++ b/flama/serialize/__init__.py
@@ -1,5 +1,5 @@
-from flama.serialize.data_structures import ModelArtifact
-from flama.serialize.dump import dump
-from flama.serialize.load import load
+from flama.serialize.data_structures import *  # noqa
+from flama.serialize.dump import *  # noqa
+from flama.serialize.load import *  # noqa
 
-__all__ = ["dump", "load", "ModelArtifact"]
+__all__ = ["dump", "load"]  # noqa
diff --git a/flama/serialize/data_structures.py b/flama/serialize/data_structures.py
index b9475543..6afea937 100644
--- a/flama/serialize/data_structures.py
+++ b/flama/serialize/data_structures.py
@@ -15,6 +15,8 @@
 from flama.serialize.base import Serializer
 from flama.serialize.types import Framework
 
+__all__ = ["ModelArtifact", "Compression"]
+
 
 class Compression(enum.Enum):
     fast = "gz"
@@ -31,7 +33,7 @@ def serializer(cls, framework: t.Union[str, Framework]) -> Serializer:
                 Framework.sklearn: ("sklearn", "SKLearnSerializer"),
                 Framework.keras: ("tensorflow", "TensorFlowSerializer"),
                 Framework.tensorflow: ("tensorflow", "TensorFlowSerializer"),
-            }[Framework(framework)]
+            }[Framework[framework] if isinstance(framework, str) else framework]
         except KeyError:  # pragma: no cover
             raise ValueError("Wrong framework")
 
@@ -242,7 +244,8 @@ def dump(
         :param compression: Compression type.
         :param kwargs: Keyword arguments passed to library dump method.
         """
-        with tarfile.open(path, f"w:{Compression(compression).value}") as tar:
+        compression = Compression[compression] if isinstance(compression, str) else compression
+        with tarfile.open(path, f"w:{compression.value}") as tar:
             if self.artifacts:
                 for name, path in self.artifacts.items():
                     tar.add(path, f"artifacts/{name}")