Lifetimes in the FFM API

[Maurizio Cimadamore]

Hi,
as promised, we have just published a writeup on the role of lifetimes 
in the FFM API:

https://inside.java/2023/01/23/lifetimes-in-the-ffm-api/

This document should be useful to understand the rationale behind the 
lifetime-centric approach of the FFM API, as well as to show some 
non-obvious ways in which clients can take advantage of what the API 
provides, e.g. to model external allocation in a safe manner and/or to 
define custom closeable allocators.

Cheers
Maurizio