Add allocation tests for ruby2_keywords #10761
Merged
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This tests ruby2_keywords flagged methods, as well as passing ruby2_keywords flagged hashes to other methods.
Some of the behavior here is questionable, such as allocating different numbers of objects depending on whether a block is passed or whether YJIT is enabled. I think there are likely ways to eliminate allocations in certain cases. However, this gives us a baseline and shows us where it is possible to make improvements.