Update: Rewrite the f_serialize functions.

Update: Rewrite the f_serialize functions.

The code is outdated and needs to be updated with the current practices.
I remember being uncertain on what to name several of these functions.
I didn't want an f_unserialize function because that would require a separate project (even if the naming makes sense).
Perhaps I may do that in the future, but for now just use the words "from" and "to".