code: func (obj *Doc) CheckNumberOrExpressionRaw(ctx context.Context, expr string) (string, json.RawMessage, error) {
  	result := &struct {
  		ErrorMsg string	`json:"qErrorMsg"`
  		BadFieldNames json.RawMessage	`json:"qBadFieldNames"`
  	} {}
  	err := obj.rpc(ctx, "CheckNumberOrExpression", result, ensureEncodable(expr))
  	return result.ErrorMsg, result.BadFieldNames, err 
  }
docs: // Checks if:
  // 
  // • A given expression is valid.
  // 
  // • A number is correct according to the locale.
  //
  // Parameters:
  //
  // ◾ expr   -   Expression to check.
  //