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>Looking at it naively, it seems to follow the rules for the arguments object in Crankshaft

I've never managed to find a good source on the V8 internals and how to target these optimizations (the "rules for the arguments object" the author alludes to).

Any recommendations?

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this [1] is probably what you want

1. https://github.com/petkaantonov/bluebird/wiki/Optimization-k...

Thanks! The linked repo [1] is also great:

[1] https://github.com/vhf/v8-bailout-reasons

They are complementary resources, "Optimization killers" helps you avoid pitfalls in practice, "v8-bailout-reasons" tries to document and explain the various Crankshaft bailouts.

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