QualityExtensions includes many general-purpose, reusable methods that are compatible with/built-upon Facets (2.4.1) but not (yet) included in Facets... including FileTest.binary_file?, Enumerable#enum, String#digits_only, send_if_not_nil, send_if_true, send_unless, Kernel#capture_output, Kernel#backtrace, Symbol#=~, Hash#hash_select, Hash#delete_unless, Array#expand_ranges, assert_changed, assert_contains, and many more.