Function valueToString

docs/tests/v2/es6/js/sanddance.js:153021–153036

(value)

}

function valueToString(value) {
  if (value == null) {
    return '';
  }

  switch (typeof value) {
    case 'string':
      return value;

    case 'boolean':
    case 'number':
      return value.toString();
  }

  return '';
}

function isStringOperation(ex) {
  switch (ex.operator) {