Gem::Dependency#to_spec

# File tmp/rubies/ruby-3.3.0/lib/rubygems/dependency.rb, line 324
def to_spec
  matches = to_specs.compact

  active = matches.find(&:activated?)
  return active if active

  unless prerelease?
    # Move prereleases to the end of the list for >= 0 requirements
    pre, matches = matches.partition {|spec| spec.version.prerelease? }
    matches += pre if requirement == Gem::Requirement.default
  end

  matches.first
end