Named function parameter calls parsed incorrectly

[arxenix]

function subCall(uint a, uint b) public pure returns(uint) {
    return sub({arg2: b, arg1: a});
}

function sub(uint arg1, uint arg2) public pure returns(uint) {
    return arg1 - arg2;
}

Output:

 Function FunctionCalls.subCall(uint256,uint256)
                Expression: sub(b,a)
                IRs:
                        TMP_15(uint256) = INTERNAL_CALL, FunctionCalls.sub(uint256,uint256)(b,a)
                        RETURN TMP_15

Expected:

 Function FunctionCalls.subCall(uint256,uint256)
                Expression: sub(a,b)
                IRs:
                        TMP_15(uint256) = INTERNAL_CALL, FunctionCalls.sub(uint256,uint256)(a,b)
                        RETURN TMP_15