Preserve insertion order of object keys #4
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This PR adds a feature
preserve_orderwhich, when enabled, preserves the order of appearance of fields from the source JSON in objects. It uses IndexMap as a drop-in replacement for HashMap in theObjectStrategystruct but leaves therequired_propertiesas aHashSet(they remain sorted in the output).This makes it very useful in some scenarios and hopefully will retain the performance on codspeed benchmarks, which you'd expect since IndexMap is based on the same hash algorithm as HashMap