Lua 5.4.0 (beta) freeze planned this week

Changes from Lua 5.3

- new generational mode for garbage collection

- to-be-closed variables

- const variables

- userdata can have multiple user values

- new implementation for math.random

- warning system

- debug information about function arguments and returns

- new semantics for the integer 'for' loop

- optional 'init' argument to 'string.gmatch'

- new functions 'lua_resetthread' and 'coroutine.close'

- coersions string-to-number moved to the string library

- allocation function allowed to fail when shrinking a memory block

- new format '%p' in 'string.format'

- utf8 library accepts codepoints up to 2^31

Prior HN discussion on Lua 5.4.0 (beta):

https://news.ycombinator.com/item?id=21145676