Core Utilities for the 'rtemis' Ecosystem R package rtemis.core version 0.0.3 Utilities used across packages of the 'rtemis' ecosystem. Includes the msg() messaging system and the fmt() formatting system. Provides test_* functions that return logical values, check_* functions that throw informative errors, and clean_* functions that return validated and coerced values. This code began as part of the 'rtemis' package (<doi:10.32614/CRAN.package.rtemis>). Software Depends: R (>= 4.1.0) Imports: cli, data.table, methods, S7 Suggests: testthat (>= 3.0.0) E.D. Gennatas <gennatas@gmail.com> Comprehensive R Archive Network (CRAN) E.D. Gennatas [aut, cre, cph] (ORCID: <https://orcid.org/0000-0001-9280-3609>) GPL (>= 3) 2026-04-21 application/tgz https://CRAN.R-project.org/package=rtemis.core doi:10.32614/CRAN.package.rtemis.core