lib/classes/Variables.js/Variables/makeDeepVariable
class Variables:  makeDeepVariable(variable) {
    let index = this.deep.findIndex((item) => variable === item);
    if (index < 0) {
      index = this.deep.push(variable) - 1;
    }
    const variableContainer = variable.match(this.variableSyntax)[0];
    const variableString = this.cleanVariable(variableContainer).replace(/\s/g, '');
    return variableContainer
      .replace(/\s/g, '')
      .replace(variableString, `deep:${index}`);
  }