message: omit redundant code
diff: * @author Sebastian Bittrich <sebastian.bittrich@rcsb.org>
  */
  -import { StringBuilder, deepEqual } from '../../../mol-util';
  +import { StringBuilder } from '../../../mol-util';
  import Writer from '../../../mol-io/writer/writer';
  import { Encoder, Category, Field } from '../../../mol-io/writer/cif/encoder';
  import { ComponentBond } from '../../../mol-model-formats/structure/property/bonds/comp';
  @@ -89,17 +89,12 @@ export abstract class LigandEncoder implements Encoder<string> {
  protected getAtoms<Ctx>(instance: Category.Instance<Ctx>, source: any): Atom[] {
  const sortedFields = this.getSortedFields(instance, ['Cartn_x', 'Cartn_y', 'Cartn_z', 'type_symbol']);
  const label_atom_id = this.getField(instance, 'label_atom_id');
  -
  - // all of this is used to ensure that only 1 residue is written
  - const auxiliaryFields = this.getSortedFields(instance, ['label_seq_id', 'label_asym_id', 'pdbx_PDB_ins_code', 'pdbx_PDB_model_num']);
  -
  - return this._getAtoms(source, sortedFields, label_atom_id, auxiliaryFields);
  + return this._getAtoms(source, sortedFields, label_atom_id);
  }
  - private _getAtoms(source: any, fields: Field<any, any>[], label_atom_id: Field<any, any>, auxiliaryFields: Field<any, any>[]): Atom[] {
  + private _getAtoms(source: any, fields: Field<any, any>[], label_atom_id: Field<any, any>): Atom[] {
  const atoms: Atom[] = [];
  let index = 0;
  - let id: (string | number)[] | undefined = void 0;
  // is outer loop even needed?
  l: for (let _c = 0; _c < source.length; _c++) {
  @@ -112,16 +107,6 @@ export abstract class LigandEncoder implements Encoder<string> {
  while (it.hasNext) {
  const key = it.move();
  - // ensure only a single residue is written
  - // TODO fairly certain this can be done at query level
  - if (!id) {
  - id = auxiliaryFields.map(af => af.value(key, data, 0));
  - } else {
  - if (!deepEqual(id, auxiliaryFields.map(af => af.value(key, data, index)))) {
  - break l;
  - }
  - }
  -
  const lai = label_atom_id.value(key, data, index) as string;
  const label = this.getLabel(lai);
  if (this.skipHydrogen(label)) {
  