Suggestion: arbitrary constant types

[云风 Cloud Wu <cloudwu@...>]

The type of constants in Lua can only be boolean, number, string now.
It looks good If it can support more types.

My suggestion is that if it assigns a global var to a const local var,
 the var is evaluated during the loading stage rather than running.

Idioms like :

local print <const> = print

function foobar()
   print "Hello World"
end

The local print can be a light C function constant. It can reduce the
memory footprint (fewer upvalues) and may faster. And it's more
friendly to the JIT or AOT compiler.











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