A day for padstack struct design and padstack I/O.
Today the padstack structs got their "final form", which also means the details of how they will work are set. In lihata v4 format, pad stacks can be saved and loaded, with losless round trip.
It is also possible now to convert selected objects (or buffer objects) to a pad stack.
Pad stack is not a stable feature yet: please do not use them or lihata v4 until further notice (expected mid November).