Perf optimization for `url_for` called w/ Hash
Benchmarking the existing code: ```ruby { :only_path => options[:host].nil? }.merge!(options.symbolize_keys)) ``` Against optimized code, that does not require a new hash or a merge: ```ruby options = options.symbolize_keys options[:only_path] = options[:host].nil? unless options.key?(:only_path) options ``` We see a statistically significant performance gain: ![](https://www.dropbox.com/s/onocpc0zfw4kjxl/Screenshot%202014-08-14%2012.45.30.png?dl=1) Updated to not mutate incoming parameters
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