APE track/disk numbers are not properly converted when writing

[Serial-ATA]

Reproducer

I tried this code:

use lofty::{Accessor, Tag, TagExt, TagType};

fn main() {
    let mut tag = Tag::new(TagType::APE);
    tag.set_track(5);
    tag.set_track_total(15);
    tag.save_to_path("foo.mp3").unwrap();
}

Summary

When using Tag, the track/disk numbers are not properly converted when saving to an APE tag. This is identical to #145, as it will be saved as two separate items: ........Track.5........Track.15.

This issue was fixed for ID3v2 in #149, which stores number pairs in the same format. The fix should be similar, if not identical.

Expected behavior

No response

Assets

No response

[uklotzde]

Common functions and constants should extracted and shared, not duplicated. Maybe also some tests need to be generalized.