Serial Generator
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This module provides api which generates thread safe unique serial number for a given key.
Q) How is this different from nid?
A) nid serial is unique across all nodes created in the system. Serial Generator generates a different sequence based on key provided by user.
Example: If you have 10 different exams and multiple submissions for each exam, every exam's submissions have separate sequence (usually starts with 1), exam name being the key.
