perf: Make getProjectionStyles write instead of return fresh obj #3247
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The microbenchmark seems to hint to better performance over `Object.assign`: https://esbench.com/bench/683f2196545f8900a4de2d41
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Stack on #3245.
Idea here: #3245 (comment).
This way we save an object allocation, plus can skip the
for..inloop, as we makegetProjectionStyleswrite to the target node styles directly.The types are a bit hacky here, but that was the least invasive fix I could think of (without duplicating all the logic).