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Summary of changes for compliance (ethereum/execution-apis PR 762) see ethereum/execution-apis#762) The changes fix the EVM tracer JSON output (structLog) to align with the Ethereum JSON-RPC specification. --- 1. Last memory word truncation Before: the loop used i+32 <= len(memData), silently dropping the last chunk when memory size was not an exact multiple of 32 bytes. After: the loop iterates over all bytes; the last partial chunk is zero-padded to 32 bytes, as required by the spec (each memory word is always 32 bytes). --- 2. Missing 0x prefix on storage and memory Before: storage keys/values and memory words were serialized as raw hex (e.g. "0000...0001"). After: all hex values are emitted with the 0x prefix (e.g. "0x0000...0001"), as required by the Ethereum JSON-RPC specification. --- 3. error field always present even without errors Before: the "error" field was serialized as "error": "" even when no error occurred. After: with omitempty the field is omitted entirely when there is no error, making the output cleaner and consistent with the behavior expected by clients and Hive tests. --- Impacted APIs * debug_traceTransaction * debug_traceBlockByNumber * debug_traceBlockByHash * debug_traceCall * debug_traceCallMany All three fixes are covered by unit tests in the new json_stream_test.go file. Out of this PR is keyword to anable/disable and default value for them ### Tracer Configuration Comparison | Field | Erigon | Geth | Spec #762 | Aligned | | :--- | :--- | :--- | :--- | :---: | | **Memory** | `disable=false` (ON) | `Enable=false` (OFF) | `enable=false` (OFF) | ❌ | | **Stack** | `disable=false` (ON) | `Disable=false` (ON) | `disable=false` (ON) | ✅ | | **Storage** | `disable=false` (ON) | `Disable=false` (ON) | `disable=false` (ON) | ✅ | | **Return** | `disable=false` (ON) | `Enable=false` (OFF) | `enable=false` (OFF) | ❌ | --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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Found problem with memory in tests:
eth/downloader/downloader_test.goin init method reduce some big constants to use less memory, buteth/downloader/testchain_test.goreading constants values beforeinitmethod run.Fixed and reduced lmdb in-mem limit from 64mb to 32mb.