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+* Unique the segment keys array for non-optimized url helpers
+
+ In Rails 3.2 you only needed pass an argument for dynamic segment once so
+ unique the segment keys array to match the number of args. Since the number
+ of args is less than required parts the non-optimized code path is selected.
+ This means to benefit from optimized url generation the arg needs to be
+ specified as many times as it appears in the path.
+
+ Fixes #12808
+
+ *Andrew White*
+
* Show full route constraints in error message
When an optimized helper fails to generate, show the full route constraints