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Rather than block hashes (represented by the fields `.sha256` and `.hash`) being stateful, simply compute them on-the-fly. This ensures that the correct values are always returned and takes the burden of rehashing from test writers, making the code shorter overall. In a first step, the fields are kept at the same name with @property functions as drop-in replacements, for a minimal diff. In later commits, the names are changed to be more descriptive and indicating the return type of the block hash.