Frozen string literal support #465
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This commit addresses the `warning: literal string will be frozen in the future` warnings appeared at Rails CI https://buildkite.com/rails/rails-nightly/builds/1122#019263a3-2200-4e62-a6a8-028cffa60aaf Here are the warnings appeared: ``` /usr/local/lib/ruby/gems/3.4.0+0/bundler/gems/httpclient-d57cc6d5ffee/lib/httpclient.rb:1256: warning: literal string will be frozen in the future /usr/local/lib/ruby/gems/3.4.0+0/bundler/gems/httpclient-d57cc6d5ffee/lib/httpclient/http.rb:580: warning: literal string will be frozen in the future /usr/local/lib/ruby/gems/3.4.0+0/bundler/gems/httpclient-d57cc6d5ffee/lib/httpclient/session.rb:954: warning: literal string will be frozen in the future /usr/local/lib/ruby/gems/3.4.0+0/bundler/gems/httpclient-d57cc6d5ffee/lib/httpclient/util.rb:71: warning: literal string will be frozen in the future ``` There should be some warnings remained because Rails CI does not use all of httpclient code. I'll open some pull requests later to address remaining ones. Ref: https://bugs.ruby-lang.org/issues/20205
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Assume string literals are frozen by default for Ruby 3.4+ compatibility. Builds on #462.
/cc @yahonda