avoid some trivial memory allocations #2587
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* pre-allocate `blobify` data and remove redundant error handling (cannot fail on correct data) * use threadvar for temporary storage when decoding rdb, avoiding closure env * speed up database walkers by avoiding many temporaries ~5% perf improvement on block import, 100x on database iteration (useful for building analysis tooling)
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blobifydata and remove redundant error handling (cannot fail on correct data)~5% perf improvement on block import, 100x on database iteration (useful for building analysis tooling)