On the question of value for list types generated by Ngx.shared.DICT.lpush, I should how to get the value for this list type, Ngx.shared.DICT.get returns the nil value

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  (if any), the NGINX core version, the ngx_lua module version,
  and your operating system version.
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Start with the ngx.shared.DICT.lpush and ngx.shared.DICT.get entry points named in the report. Gather the missing OpenResty, NGINX, ngx_lua, and operating-system versions, then create a minimal standalone reproduction showing the list write and read. Done requires a reproducible result and a confirmed expected behavior or resolution.