docs: def dependencies(dist, recursive=False, info=False):
      """Yield distribution's dependencies."""
  
      def case_sorted(items):
          """Return unique list sorted in case-insensitive order."""
          return sorted(set(items), key=lambda i: i.lower())
  
      def requires(distribution):
          """Return the requirements for a distribution."""
          if recursive:
              req = set(pkg_resources.require(distribution.project_name))
              req.remove(distribution)
              return {r.as_requirement() for r in req}
          return distribution.requires()
  
      def modifier(distribution):
          """Return project's name or full requirement string."""
          return str(distribution) if info else distribution.project_name
  
      return case_sorted(modifier(r) for r in requires(dist))