static ItIt<GazelleRevisitedLine> gazelle_revisitAllLinesInChannel(long channelID, F0<GazelleEvalContext> contextMaker, O... _) {
  L<GazelleLine> lines = dm_discord_linesInChannel(channelID);
  new LS preContext;
  ret mapI(lines, line ->
    dm_gazelle_reasonAboutChatInput_v2(
      line.user, line.text, paramsPlus(_, +preContext)));
}