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Edit: /opt/alt/ruby34/share/gems/gems/bundler-2.6.9/lib/bundler/vendor/pub_grub/lib/pub_grub/strategy.rb

module Bundler::PubGrub
  class Strategy
    def initialize(source)
      @source = source

@root_package = Package.root
      @root_version = Package.root_version

@version_indexes = Hash.new do |h,k|
        if k == @root_package
          h[k] = { @root_version => 0 }
        else
          h[k] = @source.all_versions_for(k).each.with_index.to_h
        end
      end
    end

def next_package_and_version(unsatisfied)
      package, range = next_term_to_try_from(unsatisfied)

[package, most_preferred_version_of(package, range)]
    end

private

def most_preferred_version_of(package, range)
      versions = @source.versions_for(package, range)

indexes = @version_indexes[package]
      versions.min_by { |version| indexes[version] }
    end

def next_term_to_try_from(unsatisfied)
      unsatisfied.min_by do |package, range|
        matching_versions = @source.versions_for(package, range)
        higher_versions = @source.versions_for(package, range.upper_invert)

[matching_versions.count <= 1 ? 0 : 1, higher_versions.count]
      end
    end
  end
end

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