-backslashes may be escaped with backslashes. On error,
-C<expand_braced_altnerates> returns undef. These two functions are
+backslashes may be escaped with backslashes.
+
+As a special case for numeric ranges, if the braces contain only digits
+followed by two dots followed by more digits, and the digits sort in the
+correct order, then they will be treated as a sequence. If the first number in
+the sequence has leading zeroes, then all generated numbers will have that
+length, padded with leading zeroes.
+
+ "tape-{01..10}" [ "tape-01", "tape-02", "tape-03", "tape-04",
+ "tape-05", "tape-06", "tape-07", "tape-08",
+ "tape-09", "tape-10" ]
+
+On error, C<expand_braced_altnerates> returns undef. These two functions are