Really great series of articles about spellcheckers. I wish there was a similar project written in Ruby. There is https://github.com/omohokcoj/ruby-spellchecker but it serves a bit different purpose - to do safe autocorrections.

Are you considering https://github.com/wolfgarbe/SymSpell algo to do suggestions? If I recall native hunspell suggestions are quite slow - the same algo must be even slower on python.