Modules on Aptos

Aptos allows for permissionless publishing of modules within a package as well as upgrading those that have appropriate compatibility policy set.

A module contains several structs and functions, much like Rust.

During package publishing time, a few constraints are maintained:

• Both Structs and public function signatures are published as immutable.
• When publishing a module for the first time, The VM will search for and execute an init_module(account: &signer) function.