the valid range of A（annotation type value）

Why should the value of A be restricted to between 1 and 49? The values greater than 58 are pre-defined as (skip-59, num-60, sub-61, chan-62, aux-63)，Can I define the values between 49 and 58(bound included)? and lift this restriction?

https://github.com/MIT-LCP/wfdb-python/blob/main/wfdb/io/annotation.py#L563

        elif field == "label_store":
            if min(item) < 1 or max(item) > 49:
                raise ValueError(
                    "The label_store values must be between 1 and 49"
                )

Start in wfdb/io/annotation.py around the label_store validation at line 563, then review how annotation values above 49 are represented, including the predefined values 59–63. Confirm whether values 49–58 are valid in the WFDB format and update the validation behavior accordingly; done means the restriction matches the format specification.