Fixed #19537 -- Made CheckboxInput._has_changed handle 'False' string

Thanks dibrovsd@gmail.com for the report.

1 files changed, 3 insertions, 0 deletions

diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index c761ea857d..4782b99117 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -533,6 +533,9 @@ class CheckboxInput(Widget):
     def _has_changed(self, initial, data):
         # Sometimes data or initial could be None or '' which should be the
         # same thing as False.
+        if initial == 'False':
+            # show_hidden_initial may have transformed False to 'False'
+            initial = False
         return bool(initial) != bool(data)
 
 class Select(Widget):