'Calculate a value' should support output data type

When calculating with numeric values, it frequently appears that the output data type doesn't match that of a field. Before assigning such an output variable to an entity's field, conversion is required. This leads to frequent action-pairs of 'Calculate a value' and 'Convert data type' with extra-cost in configuration and most likely memory usage and performance.

It would be nice to be able to specify the output type of 'Calculate a value' directly.