NfcMessageData

http://w3c.github.io/nfc/index.html#the-nfcmessagedata-interface

Does the NfcMessageData.arrayBuffer contain the raw bytes for the NDEF
record?

Does the NfcMessageData.blob contain only the payload data?

How do I get additional TNF and/or Record Type data from the NfcMessageData
to interpret the Blob? For these 2 records, I'd need different logic to
parse the payload into something usable.

   TNF: 4 (External)
   Type: example.com:patientRecord
   Payload: <some binary content>

   TNF: 2 (Media-type)
   Type: text/led
   Payload: <some binary content>

Will TNF External (TNF=4) records end up as a Blob?