+ Expired pcache entries are now purged when Emacs is killed.
+ Preform additional type checks for better runtime safety.
+ TTL argument can now be a predicate function. Takes two arguments: the
key and value, if it returns nil, consider the entry stale.
+ Add doom-store-rem
+ Add real doom-store-member-p (to replace doom-store-exists alias)
+ Fix doom-store-clear not clearing in-memory store
+ Add doom-store-flush
+ Add deferred flushing through doom--inhibit-flush lexical var
+ Update doom-store-persist & doom-store-desist for new API
