solidjs / solid / 43190408618

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perf(signals): copy the mapArray source list once per pass (#4785)

mapArray read its source list throughout a pass and copied it at the end for the next pass's comparison. A deep store list answers every slot read through a proxy trap, so each slot went through the proxy three or four times per pass. The pass now copies the list first, diffs and maps the copy, and keeps it as the saved list.

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