QUESTION : Feature length about the non-negotiable feature

[Wei Yongjun <yjwei@xxxxxxxxxxxxxx>]

Now non-negotiable feature does not has a fix size, it's length is 
decide by the value of the non-negotiable feature. For example, the 
client send Sequence Window Feature as the following: 0x23 0x04 0x03 
0x64, the Sequence Window Feature has the length of 1-byte only.

But RFC4340 said:

7.5.2.  Sequence Window Feature
  Sequence Window has feature number 3 and is non-negotiable.  It 
takes  48-bit (6-byte) integer values, like DCCP sequence numbers.  
Change  and Confirm options for Sequence Window are therefore 9 bytes long.

Is this correct? Or there are some RFCs said the non-negotiable feature 
has variable length?



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