message: use BOM marker instead of ZWS
  that's what others do ...
diff: @@ -33,7 +33,8 @@ function insertAfter(node, nodeToInsert) {
  }
  }
  -export const ZERO_WIDTH_SPACE = "\u200b";
  +// this is a BOM marker actually
  +export const ZERO_WIDTH_SPACE = "\ufeff";
  // a caret node is a node that allows the caret to be placed
  // where otherwise it wouldn't be possible
  // (e.g. next to a pill span without adjacent text node)
  