PkgImages

This "package" is a prototype for various operations needed for a next-generation package cache in Julia, targeted to be merged in the Julia 1.9 and/or 1.10 timeframe. Many of these operations are currently performed in Julia's dump.c (and perhaps soon, staticdata.c); at present it seems possible that at least a subset of this could be written in Julia and move into Core. If that isn't viable, then at least this package may be useful for planning implementations.

Features that are implemented or in-progress include:

• handling of backedges and their validation in the user's environment