New features

• New predicate functions check if an object can be safely coerced to a specific type. The is_*_ish() family (is_chr_ish(), is_dbl_ish(), is_fct_ish(), is_int_ish(), and is_lgl_ish()) checks the entire object at once. The are_*_ish() family (are_chr_ish(), are_dbl_ish(), are_fct_ish(), are_int_ish(), and are_lgl_ish()) checks each element of a vector individually (#23, #93).
• New functions for working with doubles are available: to_dbl(), to_dbl_scalar(), stabilize_dbl(), and stabilize_dbl_scalar() (#23).
• stabilize_chr() now accepts patterns from stringr::regex(), stringr::fixed(), and stringr::coll() (#87), and can generate more informative error messages for regex failures via the new regex_must_match() and regex_must_not_match() helper functions (#52, #85, #86, #89).

Minor improvements and fixes

• Error messages are now clearer and more standardized throughout the package (#95).
• to_*() functions now consistently flatten list-like inputs when no information would be lost in the process (#128).
• to_fct() now lists the allowed values in its error message when a value is not in the expected set, making it easier to debug (#67).
• to_lgl() now coerces character representations of numbers (e.g., "0" and "1") to FALSE and TRUE respectively (#30).

Documentation

• The purpose of and vision for this package are now more clearly described in documentation (#56, #77).
• New vignette("stbl") provides an overview of the package and its functions (#42).