[$] What's new in Lua 5.4

Lua version 5.4 was released at theend of June; it is the fifteenth major version of the lightweight scriptinglanguage since its creation in 1993. New in 5.4 isa generationalmode for the garbage collector, which performs better for programs withlots of short-lived allocations. The language now supports "attributes" onlocal variables, allowing developers to mark variables as constant(const) or resources as closeable (close). There werealso significant performance improvements over 5.3 along with a host ofminor changes.