Make `AnyCalendar` `Copy`#7434

Draft

robertbastian wants to merge 19 commits intounicode-org:mainfrom

robertbastian:ffi

Commits on Dec 19, 2025

Commits on Dec 22, 2025

Commits on Dec 23, 2025

Commits on Dec 30, 2025

data-driven era indices
robertbastian
committed

Commits on Jan 14, 2026

Merge remote-tracking branch 'upstream/main' into japanext2
robertbastian
committed