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# Unique, atomic sequential number generator using MongoMapper, MongoDB and Ruby.
# Usage:
# Helper::Sequence.next_value(:my_seq)
# => 1
# Helper::Sequence.next_value(:my_seq)
# => 2
# Helper::Sequence.next_value(:my_other_seq)
# => 1
# Helper::Sequence.next_value(:my_seq)
# => 3