The `default` pruning strategy, specifically the total number of recent blocks to keep (currently 100), was decided on completely arbitrary.
I propose we change it to be enough blocks given that the typical block time is 5s and typical unbonding period is 21 days:
(3600*(24/5)) * 21 = 362880.
I propose this because anyone wishing to run an IBC relayer, which will be most chains, will have to be required to use `custom` to set it to this value anyway. So why not just make it the default and make it easier for operators.
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