[RFC] deduplicate strings VM-wide in Ruby 2.5+

String#-@ deduplicates strings starting with Ruby 2.5.0 Hash#[]= deduplicates strings starting in Ruby 2.6.0-rc1 This allows us to save a small amount of memory by sharing objects with other parts of the stack (e.g. Rack). --- RFC because I've only lightly-tested this and only with Ruby

Re: [RFC] deduplicate strings VM-wide in Ruby 2.5+

Since 'mkmf' is already in the fstring table as that exists in the source; so I'll at least have to squash this on top for Ruby <=2.5: diff --git a/ext/unicorn_http/extconf.rb b/ext/unicorn_http/extconf.rb index 5b7a8ca..d5f81fb 100644 --- a/ext/unicorn_http/extconf.rb +++