In Perth last week I was showing the new FieldOptions property on datasets. As part of the demo, I had to create a calculated field, and when I brought up the New Field dialog an audience member suggested I create an InternalCalc field instead.
I’d never heard of an InternalCalc field at the time, so later I did some research into what they are. In FireDAC they do everything a normal Calculated Field does, but in addition, you can define the value using the DefaultExpression property of the field, rather than having to write an OnCalcFields event handler.