The Solidity compiler has released version 0.8.19, introducing user-defined value type definition operators

ChainCatcher news, the Ethereum programming language Solidity has released version 0.8.19 of the Solidity compiler. The latest version includes a series of improvements and introduces user-defined value type definition operators to prevent dead code in runtime bytecode. Issues with internal library functions and free functions called through modules reported by @sifislag have been fixed in this version. The team recommends users on Solidity versions lower than 0.8.0 to upgrade. (Source link)