Update rest_framework/fields.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: auvipy

rest_framework/fields.py

@@ -1769,9 +1769,13 @@ def to_internal_value(self, data):
         Dicts of native values <- Dicts of primitive datatypes.
         """
         if html.is_html_input(data):
-            data = html.parse_html_dict(data, default={}) or {
-                k: v for k, v in data.items()
-            }
+            # Coerce HTML form inputs (e.g. QueryDict/MultiValueDict) to a plain dict.
+            # Use `.dict()` when available to preserve existing behaviour of taking
+            # the first value for each key, otherwise fall back to `dict()`.
+            if hasattr(data, 'dict'):
+                data = data.dict()
+            else:
+                data = dict(data)
         if not isinstance(data, dict):
             self.fail('not_a_dict', input_type=type(data).__name__)
         if not self.allow_empty and len(data) == 0: