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Since we have split out keyword argument handling, all hashes are "literal" hashes and we no longer use this flag.
Small hashes are defined as anything five pairs or smaller, for which we can use a single bucket and save overall by not creating as big a bucket or rehashing during insertion. The resulting hash may rehash later when elements are added. For a three-pair hash this improves a looping hash creation bench by 33%.
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A collection of experiments to fix profile hot spots in a simple Rails app.