local l = _iterables:listOf(1, 2, 3)
local s = _iterables:toMutableSet(l)
-- 可变 Set 可以修改
s:add(3)
s:add(4)
s:add(5)
s:add(6)
_objectWrappers:wrap(s):forEach(function(it)
    _console:log(it)
end)