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from typing import Optional, Any, NewType
from jsons.exceptions import SerializationError
def default_primitive_serializer(obj: object,
cls: Optional[type] = None,
**kwargs) -> object:
"""
Serialize a primitive; simply return the given ``obj``.
:param obj: the primitive.
:param cls: the type of ``obj``.
:return: ``obj``.
"""
result = obj
cls_ = cls
if _is_newtype(cls):
cls_ = cls.__supertype__
if cls_ and obj is not None and not isinstance(obj, cls_):
try:
result = cls_(obj)
except ValueError as err:
raise SerializationError('Could not cast "{}" into "{}"'
.format(obj, cls_.__name__)) from err
return result
def _is_newtype(cls: Any) -> bool:
try:
# isinstance(cls, NewType) only works as of Python3.10.
result = isinstance(cls, NewType)
except TypeError:
result = hasattr(cls, '__supertype__')
return result