Regarding pike feature

Intersting suggestion. I'm not sure what the syntax would need to be.

Can you give a good example on how you would like to use such a
feature?

For instance the Calendar module is doing a lot of lazy evaluation;
it's calculating a lot only when asked for it but remembers the
result. An example: it might not calculate which month it is on an
object created from a unix timestamp until something asks which month
it is.

It can be solved with getters in classes/objects.