What purpose does the "calldata" serve in this parameter _owners? Is it a new keyword?
function setup(address calldata _owners, uint256 _threshold, address to, bytes calldata data)
Taken from Gnosis Safe Contract - GnosisSafe.sol
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As per the Solidity version 0.5.0 breaking changes here :
Explicit data location for all variables of struct, array or mapping types is now mandatory. This is also applied to function parameters and return variables.
So currently, reference types comprise structs, arrays and mappings. If you use a reference type, you always have to explicitly provide the data area where the type is stored:
storage (the location where the state variables are stored)
calldata (special data location that contains the function arguments, only available for external function call parameters).
So here in the shared contract, data location has been mentioned which is
calldata. Hope it helps.