signTransaction should return r, s, and v without leading 0's

[caochao]

i got a error dialog with prompt "non-canonical integer (leading zero bytes) for *big.Int, decoding into (types.Transaction)(types.txdata).R" while send tokens using emerald-wallet.
it happens occasionally.

related issues:
web3/web3.js#1126
web3/web3.js#1170
web3/web3.js#1288

[caochao]

@gagarin55 what's your implemention of rpc interface "emerald_signTransaction"? i think you should read this eth.accounts.signTransaction: expected r & s to be treated as quantity, not data

[gagarin55]

For now it uses this RPC method - https://github.com/ETCDEVTeam/emerald-rs/blob/master/docs/api.md#emerald_signtransaction

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