Current version is 2.5

* Changes since version 2.4
  + io and string libraries are now based on pattern matching;
    the old libraries are still available for compatibility
  + dofile and dostring can now return values (via return statement)
  + better support for 16- and 64-bit machines
  + expanded documentation, with more examples

* Changes since version 2.2
  + external compiler creates portable binary files that can be loaded faster
  + interface for debugging and profiling
  + new "getglobal" fallback
  + new functions for handling references to Lua objects
  + new functions in standard lib
  + only one copy of each string is stored
  + expanded documentation, with more examples

* Changes since version 2.1
  + functions now may be declared with any "lvalue" as a name
  + garbage collection of functions
  + support for pipes

* Changes since version 1.1
  + object-oriented support
  + fallbacks
  + simplified syntax for tables
  + many internal improvements