Parse a vintage tag like WEO-2026-04 into a calendar {year, month}.
WEO-2026-04
{year, month}
Returns null if the tag does not match the canonical pattern. The pattern is permissive on the prefix (WEO, FM, etc.) but strict on the YYYY-MM segment.
null
WEO
FM
Parse a vintage tag like
WEO-2026-04into a calendar{year, month}.Returns
nullif the tag does not match the canonical pattern. The pattern is permissive on the prefix (WEO,FM, etc.) but strict on the YYYY-MM segment.