Fix warnings related with Opal 2 #215
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Currently, some codes output warnings like the following. ``` warning: Backtick operator usage interpreted as intent to embed JavaScript; this code will break in Opal 2.0; add a magic comment: `# backtick_javascript: true` -- ./try_ruby.rb: ``` https://github.com/ruby/TryRuby/actions/runs/17408494030/job/49419277575#step:4:8 In Opal 2, `backtick_javascript` defaults to false, because `Kernel#backtick` is implemented. Files using inline JavaScript must add the `# backtick_javascript: true` magic comment. Ref: opal/opal#2746
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Currently, some codes output warnings like the following.
https://github.com/ruby/TryRuby/actions/runs/17408494030/job/49419277575#step:4:8
In Opal 2,
backtick_javascriptdefaults to false, becauseKernel#backtickis implemented. Files using inline JavaScript must add the# backtick_javascript: truemagic comment.Ref: opal/opal#2746