fix: replace mainnet TTD so geth mainnet genesis parsing works #5290
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This is a hack to make parsing default geth mainnet
genesis.json
files work. This all stems from fundamental limitations ofserde_json
, which does not support numbers larger thanu64
by default, meaning the TTD cannot be deserialized. This limitation also makesvisit_u128
implementations useless. Theoretically this would be solved by using thearbitrary_precision
feature inserde_json
, but that has its own problems, which propagates to users:gakonst/ethers-rs#2206
This replaces the mainnet TTD with the TTD surrounded by quotes, because
JsonU256
is able to deserialize strings. This solution does not work for other networks. AFAIK all test networks do not have TTD values larger thanu64
, so they do not need this hack in the first place.The hack: