AppVeyor CII CMD Codecov coercible config DateTimeClasses dbi DBIDriver DBIResult dblog debugme desc dev devtools difftime DML extensibility hadley hostname Kazam lintr lookahead lookaheads metaprogramming noLD NOTEs parametrized README Reenable RMariaDB RMySQL roundtrip Roundtrip roundtripping roxygen RPostgres RSQLite rstats sql subclasses subqueries subquery termnull testthat untyped vctrs vectorization vectorized vectorizes