x = {
__type = 'number',
}
y = setmetatable({}, x)

print(type(y)) -- 'table'

_G.old_type = type

type = function(target)
local mt = getmetatable(target)
if mt and mt.__type and type(mt.__type) == 'string' then
return mt.__type
end
return old_type(target)
end

print(type(y)) -- 'number'