Improve storage lookup performance #7336
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Some code I had left from the weekend, where I looked into the cost of querying the store during eval, and if that could be improved. The code here is mostly benchmarks that I found useful for that purpose, but also includes a few optimizations of code that is on the hot path for these lookups and as such has a high impact — as the benchmarks demonstrate.
The small change in eval.go is the first use of the new feature of object.Map added some days ago, where a map function returning a nil key means skipping that key/value pair.