do-shwhy

Please take all your time for this one. I see no good reason for updating new features for levelDB which is an essential modules. I personally disagree these great changes.

`Base58CheckDecode`'s check may cause hard fork, we'd better have an empty string tested here on both older version and newer version

> In the old version, `if(input is null)` was always `false`, because the parameter type is `string`, not `string?` I thought that the empty string `""` may cause differ results...

https://github.com/guberti/witness-encryption-demos/blob/f7306293e6110731cc81181361152d68cf3a8841/puzzles/sudoku1.c#L1-L18 I noticed an issue in the sudoku1 puzzle. The subsets used are all drawn from the set {0, 1, 2, ..., 323}, not {0, 1, 2, ..., 727}. It...

I bet what you called is actually `mainnet forking`. `neo-fairy-test` may really help you in this way.

Actually, I like your idea if someone could build a devnet and sync it periodically from mainnet and clean the temporary changes made by devnet transactions. Let's say, cleaning and...

The hard part is that when you sync your state from mainnet, the second block's committee node should be somehow changed to a set of devnet nodes. If you could...

Deploying contracts is not a concise solution. It's better to sync all of the mainnet state to devnet. Then not only the important contracts are synced, but also the small...

> The solution used by another network is deploying the contracts using the same hash. Some contracts will need setup, I'm not sure how they handle that. Could you please...

I have read the documents of FLOW. We may need support from those contract owners to identify what initialization steps should be done. And it will cost a lot for...