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-rw-r--r--lib/set.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/set.rb b/lib/set.rb
index b8ab6ab172..d405d81178 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -778,7 +778,7 @@ class SortedSet < Set
def to_a
(@keys = @hash.keys).sort! unless @keys
- @keys
+ @keys.dup
end
def freeze