docs: def get_commit_bzs(self, from_revision, to_revision=None):
          """
          Return a list of tuples, one per commit. Each tuple is (sha1, subject,
          bz_list). bz_list is a (possibly zero-length) list of numbers.
          """
          rng = self.rev_range(from_revision, to_revision)
          GIT_COMMIT_FIELDS = ['id', 'subject', 'body']
          GIT_LOG_FORMAT = ['%h', '%s', '%b']
          GIT_LOG_FORMAT = '%x1f'.join(GIT_LOG_FORMAT) + '%x1e'
          log_out = self('log', '--format=%s' % GIT_LOG_FORMAT, rng,
                         log_cmd=False, fatal=False)
          if not log_out:
              return []
  
          log = log_out.strip('\n\x1e').split("\x1e")
          log = [row.strip('\n\t ').split("\x1f") for row in log]
          log = [dict(zip(GIT_COMMIT_FIELDS, row)) for row in log]
          result = []
          for commit in log:
              bzs = search_bug_references(commit['subject'])
              bzs.extend(search_bug_references(commit['body']))
              result.append((commit['id'], commit['subject'], bzs))
          return result