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It's a status field, not an error code. 0 = False, 1 = True seems like the right way to do things.

But why not return a proper Boolean value then?

Who knows, maybe for legacy code reasons? This seems to be the documentation: https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_gettransa...

Thats how booleans are encoded in the Ethereum ABI. 0x0 is false, 0x1 is true.