uninitialized constant Addressable::IDNA::PunycodeBigOutput (NameError)

[dentarg]

Repro:

$ gem uninstall twingly-url

Select gem to uninstall:
 1. twingly-url-1.3.3
 2. twingly-url-4.2.0
 3. twingly-url-5.1.0
 4. twingly-url-5.1.1
 5. All versions
> 5
Successfully uninstalled twingly-url-1.3.3
Successfully uninstalled twingly-url-4.2.0
Successfully uninstalled twingly-url-5.1.0
Successfully uninstalled twingly-url-5.1.1

$ gem install twingly-url
Fetching: twingly-url-5.1.1.gem (100%)
Successfully installed twingly-url-5.1.1
Parsing documentation for twingly-url-5.1.1
Installing ri documentation for twingly-url-5.1.1
Done installing documentation for twingly-url after 0 seconds
1 gem installed

$ irb -rtwingly/url
/Users/dentarg/.gem/ruby/2.4.3/gems/twingly-url-5.1.1/lib/twingly/url.rb:18:in `<class:URL>': uninitialized constant Addressable::IDNA::PunycodeBigOutput (NameError)
	from /Users/dentarg/.gem/ruby/2.4.3/gems/twingly-url-5.1.1/lib/twingly/url.rb:11:in `<module:Twingly>'
	from /Users/dentarg/.gem/ruby/2.4.3/gems/twingly-url-5.1.1/lib/twingly/url.rb:10:in `<top (required)>'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:135:in `require'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:39:in `require'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/2.4.0/irb/init.rb:281:in `block in load_modules'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/2.4.0/irb/init.rb:279:in `each'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/2.4.0/irb/init.rb:279:in `load_modules'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/2.4.0/irb/init.rb:21:in `setup'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/2.4.0/irb.rb:378:in `start'
	from /Users/dentarg/.rubies/ruby-2.4.3/bin/irb:11:in `<main>'

This was not an issue in the previous version

$ gem uninstall twingly-url
Successfully uninstalled twingly-url-5.1.1

$ gem install twingly-url -v 5.1.0
Fetching: twingly-url-5.1.0.gem (100%)
Successfully installed twingly-url-5.1.0
Parsing documentation for twingly-url-5.1.0
Installing ri documentation for twingly-url-5.1.0
Done installing documentation for twingly-url after 0 seconds
1 gem installed

$ irb -rtwingly/url
irb(main):001:0>

[dentarg]

$ gem list addressable

*** LOCAL GEMS ***

addressable (2.5.2, 2.5.0, 2.4.0, 2.3.8)

[dentarg]

What I'm using

$ ruby -v
ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-darwin16]

$ gem -v
2.7.6

[dentarg]

This happens when you have idn-ruby installed:

$ gem list idn-ruby

*** LOCAL GEMS ***

idn-ruby (0.1.0)

$ irb -rtwingly/url
/Users/dentarg/.gem/ruby/2.4.3/gems/twingly-url-5.1.1/lib/twingly/url.rb:18:in `<class:URL>': uninitialized constant Addressable::IDNA::PunycodeBigOutput (NameError)
	from /Users/dentarg/.gem/ruby/2.4.3/gems/twingly-url-5.1.1/lib/twingly/url.rb:11:in `<module:Twingly>'
	from /Users/dentarg/.gem/ruby/2.4.3/gems/twingly-url-5.1.1/lib/twingly/url.rb:10:in `<top (required)>'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:135:in `require'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:39:in `require'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/2.4.0/irb/init.rb:281:in `block in load_modules'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/2.4.0/irb/init.rb:279:in `each'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/2.4.0/irb/init.rb:279:in `load_modules'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/2.4.0/irb/init.rb:21:in `setup'
	from /Users/dentarg/.rubies/ruby-2.4.3/lib/ruby/2.4.0/irb.rb:378:in `start'
	from /Users/dentarg/.rubies/ruby-2.4.3/bin/irb:11:in `<main>'


$ gem uninstall idn-ruby

You have requested to uninstall the gem:
	idn-ruby-0.1.0

twingly-url-4.1.0 depends on idn-ruby (~> 0.1)
If you remove this gem, these dependencies will not be met.
Continue with Uninstall? [yN]  y
Successfully uninstalled idn-ruby-0.1.0

$ irb -rtwingly/url
irb(main):001:0>

It is because addressable/idna looks like this

begin
  require "addressable/idna/native"
rescue LoadError
  # libidn or the idn gem was not available, fall back on a pure-Ruby
  # implementation...
  require "addressable/idna/pure"
end

We should require addressable/idna/pure to solve this.