I was reading about document routing with CompositId 
 The document says that I could prefix a shard key to a document ID like 
“IBM!12345”. It further mentioned that I could specify the number of bit for 
the shard key like “IBM/3!12345”. My question is, what is the default number of 
bit for the shard key when it is not specified? That is, what is n when 
“IBM/n!12345” is equivalent to “IBM/12345”.

Another question is regarding 2-level routing prefix. Does it support number of 
bit as well? For example, does something like “USA/2!IBM/3!12345” work?


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