Version 1.3 of package Extmap has just been released in NonGNU ELPA. You can now find it in M-x list-packages RET.
Extmap describes itself as: ============================================ Externally-stored constant mapping for Elisp ============================================ More at https://elpa.nongnu.org/nongnu/extmap.html ## Summary: Mapping of symbols to constants that is stored externally as a single binary file and loaded on-demand. Can be used for huge databases to avoid loading everything to memory. This package doesn't use any external programs, making it a suitable dependency for smaller libraries. Typical usage of the library consists of two separate stages: 1) Package maintainer/developer creates a map file, which is then distributed along with its `*.el' etc. files. 2) For end-user, Elisp code retrieves values from the pre-created map file. Creating a map file doesn't require any external tools. See function `extmap-from-alist' for details. If you use Emacs 25 or later and your map is so huge that you don't want to load it fully even when creating, see `extmap-from-iterator'. ## Recent NEWS: [Not provided 🙁]
