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146d2ee246
Replace custom `flatten` and `map` with native `flatMap` usage. Benchmark: | Test case name | Result | |---------------- |-------------------------------------------------------- | | flatten & map | flatten & map x 1,182 ops/sec ±2.18% (63 runs sampled) | | flatMap | flatMap x 6,011 ops/sec ±0.91% (35 runs sampled) | The fact that `flatMap` is faster is also highlighted in https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flatMap PR Close #48378