[This message was posted by Jacob Northey of The LaSalle Technology Group 
<[EMAIL PROTECTED]> to the "FAST Protocol" discussion forum at 
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> The effect of 2 and 3 is that the one byte in 3 gets amortized over 8
> reference occurrences of the field. Less than 8 references per
> definitions results in pmap being more compact, more than 8 references
> means leading zero byte results in definition being more compact.

Since FAST is a byte-level protocol, it is an all or nothing cost.  Either 
using an additional presence bit increases the presence map size or it doesn't. 
 This is up to template designers to take into account.

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