is_scalar_sequence_field,
    is_sequence_field,
    is_uploadfile_or_nonable_uploadfile_annotation,
    is_uploadfile_sequence_annotation,
    lenient_issubclass,
    sequence_types,
    serialize_sequence_value,
    value_is_sequence,
)
from fastapi.background import BackgroundTasks
from fastapi.concurrency import (
    asynccontextmanager,
    contextmanager_in_threadpool,
)

    new_field_info = copy(field_info)
    new_field_info.metadata = merged_field_info.metadata
    new_field_info.annotation = merged_field_info.annotation
    return new_field_info


def serialize_sequence_value(*, field: ModelField, value: Any) -> Sequence[Any]:
    origin_type = get_origin(field.field_info.annotation) or field.field_info.annotation
    if origin_type is Union or origin_type is UnionType:  # Handle optional sequences