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  <pre><span class="ruby-comment cmt"># File lib/rack/utils.rb, line 497</span>
      <span class="ruby-keyword kw">def</span> <span class="ruby-operator">[]=</span>(<span class="ruby-identifier">k</span>, <span class="ruby-identifier">v</span>)
        <span class="ruby-identifier">canonical</span> = <span class="ruby-identifier">k</span>.<span class="ruby-identifier">downcase</span>
        <span class="ruby-identifier">delete</span> <span class="ruby-identifier">k</span> <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@names</span>[<span class="ruby-identifier">canonical</span>] <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@names</span>[<span class="ruby-identifier">canonical</span>] <span class="ruby-operator">!=</span> <span class="ruby-identifier">k</span> <span class="ruby-comment cmt"># .delete is expensive, don't invoke it unless necessary</span>
        <span class="ruby-ivar">@names</span>[<span class="ruby-identifier">k</span>] = <span class="ruby-ivar">@names</span>[<span class="ruby-identifier">canonical</span>] = <span class="ruby-identifier">k</span>
        <span class="ruby-keyword kw">super</span> <span class="ruby-identifier">k</span>, <span class="ruby-identifier">v</span>
      <span class="ruby-keyword kw">end</span></pre>
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