Hi.

I try to access a metadata variable inside a lua filter with pandoc 2.1 but 
find no easy solution to cover the four cases (known to me):


   1. at the command line with: -M key:value
   2. inside a YAML block as a single line: key: value
   3. inside a YAML block printed at a second line with: key: |
   value
   4. inside a YAML block printed at a second line with: key:
     - value


Inside the lua filter I access the variable using meta['key'] but the type 
and content depends on the case.

1. returns a string
2-4. returns a table with:
  2. { [1] = { ["c"] = value,} ,}
  3. { [1] = { [1] = { ["c"] = value,} ,} ,}
  4. { [1] = { ["c"] = { [1] = { ["c"] = value,} ,} ,} ,}

Hence, an increasing nesting. How to easily "unlist" these tables or access 
the key directly? And why is there a table key "c"?

--
Regards,
Mathias

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