How to deal with DBNull but want to go into a normal field

So the conversion works ok with Dapper reflection, but with AOT it throws at this point
result.PrimaryIncome = GetValue<double>(reader, columnOffset);

I think the value might be null, but the field type is not "Nullable" (Legacy code, and is also serialised elsewhere, so defo cannot change!)

Is there some attribute that can be applied to state that DBNulls are converted to zero's (Or even Nan for doubles?)

Code:

            IEnumerable<MLModelInput> result = connection.Query<MLModelInput>(sProcName,
                    new { PoolCutOffDate = poolCutOffDate },
                    buffered: false,
                    commandTimeout: 1800,   // Set timeout to 30 mins
                    commandType: CommandType.StoredProcedure);
            return result.ToArray();  // <- Boom with AOT!!

Start with the AOT failure at result.ToArray() and review the mapping call result.PrimaryIncome = GetValue(reader, columnOffset). Check how DBNull is handled when the target field is a non-nullable double. Done requires a documented or implemented resolution for the requested DBNull-to-zero or NaN behavior.