Garbage collection and functions

[9382]

I was recently doing some testing with what would/wouldn't cause an object to be collected, and I noticed that no-longer-accessable functions aren't being cleared on garbage collection. Is this an intentional difference to regular lua, and if so, why?

I used the below code for testing:

local t = setmetatable({
	"hi",             -- Shouldn't collect
	function() end,   -- Should collect
	{},               -- Should collect
	{function() end}, -- Should collect
}, {__mode="v"})
print(t[1], t[2], t[3], t[4])
collectgarbage()
print(t[1], t[2], t[3], t[4]) -- t[2] won't collect in luau?

In regular lua 5.1, everything except t[1] will clear, but in luau, t[2] will also remain after garbage collection. Is this intended behaviour?

[vegorov-rbx]

This function is still reachable through the table literal stored in the constant table of the top-level function prototype.
Luau can store more types of literals in the constant table than Lua.

[9382]

Ah, I forgot that functions become constants due to optimisations (and also running it with -O0 will cause it to behave like lua 5.1 and collect the function), thanks