1. Regarding the GPP encoding and decoding, why must the length of bitString be a multiple of 8 first? We recently encountered some GPP strings like DBABzw~1YYNBVQVAAAAAg that don't meet this padding logic but can still be decoded via the IAB GPP Encoder / Decoder.
   Could you please share your thoughts on this?
   Thanks in advance.
2. We want to understand why there are validations for fields like mspaServiceProviderMode https://github.com/chuff/iabgpp-java/blob/master/iabgpp-encoder/src/main/java/com/iab/gpp/encoder/segment/UsNatV1CoreSegment.java. We cannot find this validation in the IAB GPP documentation.

We'd appreciate your insights on this matter. Thanks in advance.