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default and used when no alphabet is provided.

Flickr Alphabet: [0-9a-zA-Z] excluding [0OIl] to improve human readability

Bitcoin Alphabet: [0-9A-Za-z] excluding [0OIl] to improve human readability

GMP Alphabet: [0-9A-Za-v]

The encode_base58, decode_base58 and md5_base58 methods support an alphabet
parameter which can be set to the supported alphabets ['bitcoin', 'flickr',
'gmp'] to indicate the value to be encoded or decoded.

=head2 Requirements

This module requires GMP 4.2.0 and above. Prior versions are limited to Base36.

Perl 5.8.9 or above is required to ensure proper bigint handling. If you are not
using bigint numbers, it may be possible to skip the bigint tests and do a force
install; however, lower Perl versions are not supported.

=head1 FUNCTIONS