let's thank Thomas Leitner for the twenty fifth write-up in the Ruby Advent
Calendar 2020 / 25 Days of Ruby Gems series
presenting a new Ruby library every day from December 1st to December 25th.
For day 25 see the write-up titled Day 25 - hexapdf Gem - Read and
Write PDF Documents.
Start from Zero or Merge, Extract, Optimize and Much More. [1a][1b]
That's the end. Happy holidays. Merry christmas.