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Next value of a string

'89999'.succ                           # => "90000" 'nzzzz'.succ                           # => "oaaaa" 'Zzz'.succ                             # => "AAaa" 'z'.succ                               # => "aa" 'aa'.succ                              # =>  "ab" 'zz'.succ                              # => "aaa" 'AA'.succ                              # =>  "AB" 'AZ'.succ                              # =>  "BA" 'ZZ'.succ                              # => "AAA" 'aZ'.succ                              # =>  "bA" 'Zz'.succ                              # => "AAa" 'foo19'.succ                           # => "foo20" 'foo99'.succ                           # => "fop00" '99'.succ                              # => "100" '9Z99'.succ                            # => "10A00" '10-99'.succ                           # => "11-00" 'a-a'.succ                             # => "a-b" 'z-z'.succ                             # => "aa-a" 'Hello!'.succ                          # => "Hellp!" %q{'zz'}.succ                          # => "'aaa'" %q{z'zz'}.succ                         # => "aa'aa'" '$$$$'.succ                            # => "$$$%"