* upstream/master:
  feature: add option to disable forward slash escaping

* upstream/master: (22 commits)
  added -g by default.
  write sort_json, use it on perl tests to prevent hash table ordering failures
  run with gcc and clang
  ignore dtoa.c for cppcheck, don't share lua headers (breaks due to define)
  bring cppcheck back
  attempt to run openresty perl tests
  cmake doesn't support finding luajit, so skip it
  attempting to fix luajit cmake build
  use different header path for luajit make builds
  support error message testing for modern versions of lua
  add one_of testing to avoid hash table ordering causing test to fail
  make tests fail when they fail
  tell cmake where lua is
  use local lua for makefile build
  build after tests, so tests can do their own build test
  fail if tests are blocked
  see what happens if we run tests on github actions
  use macro instead of header defines for Lua 5.2+ support
  Lua 5.2+ maxn support
  Lua 5.2+ unpack support
  ...

* upstream/master:
  bump version to 2.1.0.9
  Update CI (#68)

* commit 'f50a2225b137700b7454c7b8da1266bb2329ddf1':
  Support lua 5.3 integer representation

* commit 'e02072ce28a5621725cbce23e32bbe3e38f0dcb3':
  encode integer for lua 5.3

* commit 'f5ee43d284d24c100bb11ecf286a04999bca6514':
  Compatible with lua 5.3.2

* 'master' of https://github.com/openresty/lua-cjson:
  Add updated netlib dtoa.c from https://netlib.sandia.gov/fp/dtoa.c
  feature: Add option to skip invalid value types.
  optimization: add void to functions with no arguments to prevent compiler warning.
  bumped version to 2.1.0.11. (#86)
  add lua 5.4 to test suite

回滚 T_INTEGER 的合并支持 (保持和 upsteam/master 一致)