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"
                )

从 wfdb/io/annotation.py 第563行附近的 label_store 验证开始，然后检查大于49的注释值是如何表示的，包括预定义值59–63。确认值49–58在 WFDB 格式中是否有效，并相应地更新验证行为；当该限制与格式规范一致时即表示完成。