Changes in version 0.1.1 (2026-05-15) Resubmission addressing CRAN reviewer feedback (Uwe Ligges). - License field simplified to CC BY 4.0; the + file LICENSE suffix and the accompanying boilerplate LICENSE file have been removed (the file was not used to specify additional restrictions on CC BY 4.0). Changes in version 0.1.0 Initial CRAN release. - Bundled islands reference dataset: 250 countries and territories with classifications for SIDS, SNIJ, World Bank region and income group, political association, and the four small-island defining criteria. - Predicates is_sids(), is_snij(), is_small_island() accept country names, ISO codes, or the hyphenated BES sub-codes (BQ-BO, BQ-SE, BQ-SA). - island_lookup() and add_island_cols() for tidy joining onto research data. - small_islands() shorthand for filtered subsets. - aruba() — A.R.U.B.A. (Annotated Reference for Under-coded Border Areas): a convenience wrapper around island_lookup() with Aruba as the default. A homage to Edward Cheung's A.R.U.B.A. (ASCS/NCS Relay Unit Breaker Assembly) on the Hubble Space Telescope. - Source data mirrored from github.com/University-of-Aruba/island-research-reference-data under CC BY 4.0.