- * "pass", "fail", "ok", "is", "isnt", "like", "unlike" and "cmp_ok"
- are all guaranteed to return the truth value of the test.
+ * "pass", "fail", "ok", "is", "isnt", "like", "unlike", "cmp_ok" and
+ "is_deeply" are all guaranteed to return the truth value of the
+ test.
+
+ * "isn't" (the sub "t" in package "isn") is not aliased to "isnt".
+
+ * "like" and "unlike" don't special case regular expressions that are
+ passed as '/.../' strings. A string regexp argument is always
+ treated as the source of the regexp, making "like $text, $rx" and
+ "like $text, qr[$rx]" equivalent to each other and to "cmp_ok $text,
+ '=~', $rx" (and likewise for "unlike").