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LOCALHOST definition should match any 127.0.0.0/8 address
The entire 127.0.0.0/8 range is assigned to the loopback address, not only 127.0.0.0/24. This patch allows ActionDispatch::Request::LOCALHOST to match any IPv4 127.0.0.0/8 loopback address. The only place that the #local? method was previously under test was in the show_expectations_test.rb file. I don't particularly like that that's implicitly where this code is under test, and I feel like I should move some of that testing code into the test/dispatch/request_test.rb file, but I wanted some feedback first. Credit goes to @sriedel for discovering the issue and adding the patch.
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