`loadstring or load` can cause import errors

[LecrisUT]

I was trying to run a code from lmod which imported this pacakge's json module by default. However, probably because of the use of strict, the import fails to run:

/usr/bin/lua: /usr/share/lua/5.4/json/encode/output.lua:8: variable 'loadstring' is not declared
stack traceback:
        [C]: in function 'error'
        ./libexec/../tools/strict.lua:36: in metamethod 'index'
        /usr/share/lua/5.4/json/encode/output.lua:8: in main chunk
        [C]: in function 'require'
        /usr/share/lua/5.4/json/encode.lua:12: in main chunk
        [C]: in function 'require'
        /usr/share/lua/5.4/json.lua:6: in main chunk
        [C]: in function 'require'
        ./libexec/spider:402: in local 'func'
        ./libexec/spider:494: in function 'main'
        ./libexec/spider:842: in main chunk
        [C]: in ?

lmod seems to use a syntax like:

local load       = (_VERSION == "Lua 5.1") and loadstring or load