Extracting few bitwise operators (functions) and embedding them into regular lua

[sbrbot]

I tried to extract 5 of your bitwise operators into my lua file (do not want to load whole library) but unsuccessfully-

If you have time, look at this question on StackOverflow: (https://stackoverflow.com/questions/68706031/lua-setmetatable-error-attempt-to-call-global-setmetatable-a-nil-value)

I'm new to LUA so I do not understand gema aroung memoise() function - sort of caching for functions!?