Function compare_spec_ids 

pub fn compare_spec_ids(a: &str, b: &str) -> Ordering

Compare two spec IDs with numeric sorting for member specs and base36 sequences.

This function provides a natural sort order where member spec numbers and base36 sequence portions are compared numerically rather than lexicographically. This ensures:

• Specs like 2026-01-25-00y-abc.10 sort after 2026-01-25-00y-abc.2
• Specs like 2026-01-25-010-xxx sort after 2026-01-25-00z-yyy

Sorting behavior

• For non-member specs, parses date/sequence/suffix and compares sequence numerically
• For member specs (with .N suffix), compares the base ID using date/sequence/suffix parsing first, then compares member numbers numerically
• Mixed member/non-member specs: non-members sort before members with the same base

Examples

use std::cmp::Ordering;
assert_eq!(compare_spec_ids("2026-01-25-00y-abc.2", "2026-01-25-00y-abc.10"), Ordering::Less);
assert_eq!(compare_spec_ids("2026-01-25-00y-abc.10", "2026-01-25-00y-abc.2"), Ordering::Greater);
assert_eq!(compare_spec_ids("2026-01-25-00y-abc", "2026-01-25-00y-def"), Ordering::Less);
assert_eq!(compare_spec_ids("2026-01-25-00y-abc", "2026-01-25-00y-abc.1"), Ordering::Less);
assert_eq!(compare_spec_ids("2026-01-25-010-xxx", "2026-01-25-00z-yyy"), Ordering::Greater);