• Add check_intervals().

• Add check_interval().
• Add is_string().

• Add check_lengths().
• Add check_positive().
• Deprecate where() and related functions.
• Remove dependencies on package knitr and rstudioapi.
• Remove dependency on R >= 4.1.0.

• Add is_n().
• Add check_contents().
• Add throw().
• Deprecate print_string().
• Deprecate Statement() and trigger(), please use throw().
• Remove dependencies on package magrittr and rlang.
• Add options erify.bullets and erify.n.
• Require R >= 4.1.0.

Features

• Add check_binary_classes().
• Add where() and related functions for detecting where code is running.
• Add join() and back_quote() to facilitate error message generation.

Changes

• Add n and specific in check_classes() and check_types().
• Replace specifics with specific in validator functions.
• Deprecate n in trigger().
• Deprecate supplement in Statement().

Documentation

• Revise README and vignette.
• Elaborate documentation.