Yuescript: Can YUE support empty block and some logical falsity?

Can YUE support empty block and some logical falsity?

• I hope Yue can support empty block code act as place holder for TODO and comments. Maybe we can use keyword ‘pass’ like python for this task. EX:

if os == 'win'
  print 'great'
else if os == 'mac'
  pass
else
  -- TODO: implement
  pass

• I have some personal problem with lua ‘FALSITY’. Well… when work with some other languages and yue/lua at same time, I have a tenacity to make this error: “nil and false are the only false values”. It would nice if lua behave with 0 and “” like other languages. I known I can write a function or macro to achieve this. But this make code inconvenience and look ugly. Can Yue introduce a real ‘FALSITY’ logical operator do the dirty stuff. EX:

if !val
  print 'FALSE'
if !!val
  print 'TRUE'

==> Lua

if not val or val == 0 or val == "" then
  print 'FALSE'
end
-- if val and val ~= 0 and val ~= "" then
-- or
if not (not val or val == 0 or val == "") then
  print 'TRUE'
end

• Support nullish coalescing operator like other modern languages. Maybe we can use ‘??’ op like javascript, C#. EX:

valA = nullValue ?? "default for A"
valB ??= "default for B"

==> Lua

local valA
if nullValue ~= nil then
  valA = "default for A"
end
local valB
if valB ~= nil then
  valB = "default for B"
end

Thanks and regards!