Re: sqlite3

[Qiantan Hong]

> 1. A persistent hash table can be declared as :value-mutable t.
>   In such case it will make an internal copy of its values
>   (using COPY-TREE), and we provide a
>   (PERSISTENT-HASH-CHECKPOINT &optional KEY),
>   which compares the live value of KEY and “internally cached”
>   value of KEY, store the delta if they’re different.
>   (If KEY is not provided, do it for every keys)
Clarification: I mean the live/cached value associated with key
by the hash table, not the value of key itself.