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-rw-r--r--actionview/lib/action_view/lookup_context.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionview/lib/action_view/lookup_context.rb b/actionview/lib/action_view/lookup_context.rb
index 336eaa0d8b..fd3d025cbf 100644
--- a/actionview/lib/action_view/lookup_context.rb
+++ b/actionview/lib/action_view/lookup_context.rb
@@ -280,7 +280,7 @@ module ActionView
# add :html as fallback to :js.
def formats=(values)
if values
- values = values.compact
+ values = values.dup
values.concat(default_formats) if values.delete "*/*"
values.uniq!