Set default value of filterset data to MultiValueDict

django_filters/filterset.py

@@ -5,6 +5,7 @@
 from django.db import models
 from django.db.models.constants import LOOKUP_SEP
 from django.db.models.fields.related import ManyToManyRel, ManyToOneRel, OneToOneRel
+from django.utils.datastructures import MultiValueDict
 
 from .conf import settings
 from .constants import ALL_FIELDS
@@ -176,7 +177,7 @@ def __init__(self, data=None, queryset=None, *, request=None, prefix=None):
         model = queryset.model
 
         self.is_bound = data is not None
-        self.data = data or {}
+        self.data = data or MultiValueDict()
         self.queryset = queryset
         self.request = request
         self.form_prefix = prefix