operation is not propagated when serializing to TransactionAPI

[banteg]

operation denotes a call type (0=call, 1=delegatecall). the transaction would fail if we encode the wrong operation types. multisend specifically requires to be only called as a delegatecall.

users can currently work around this by passing a kwarg like txn(sender=safe, operation=1), but this is not very convenient and it should be fixed either in the library of ape api to allow passing it over.

ape-safe/ape_safe/multisend.py

Line 250 in 4c0891b

txn_kwargs["operation"] = 1

[linear]

APE-1758 `operation` is not propagated when serializing to `TransactionAPI`

[banteg]

this simple fix in accounts.py works in the meanwhile:

    def estimate_gas_cost(self, **kwargs) -> int:
        return 0