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https://github.com/aave/protocol-v2/issues/2 Set the environment variable SKIP_LOAD to true (export SKIP_LOAD="true") then run npx hardhat compile.
when old cardinality 10. may index 3 because first 0-9 then start 0 when index=3 update cardinality =100 https://github.com/Uniswap/uniswap-v3-core-optimism/blob/da89f9b88a1616be1ef075ad4313e8aeb3532906/contracts/libraries/Oracle.sol#L78-L101
if it is bug. createPool and then increaseObservationCardinalityNext(65535). no problem. or modify contract code. @NoahZinsmeister