Inconsistent handling of TRACKNUMBER vs DISCNUMBER split fields in ogg tags.

[milesegan]

Reproducer

Try to parse a ogg or flac tag with a DISCNUMBER like 1/3.

Summary

It looks like there's some special handling for split values like 3/5 in the TRACKNUMBER field in ogg tags:

lofty-rs/lofty/src/ogg/read.rs

Line 172 in 4f81ef4

k if k.eq_ignore_ascii_case(b"TRACKNUMBER") => {

But I don't see anything similar for DISCNUMBER and when I parse a tag with a 1/3 type of tag both disk() and disk_total() come back empty.

Expected behavior

Parsing a DISCNUMBER tag like 1/3 should come back with a disk & total disks of 1 and 3.

Assets

No response

[Serial-ATA]

Yep, just a matter of changing that special case to support both TRACKNUMBER and DISCNUMBER