tlv: add new Blob type alias

In this commit, we add a new type alias for a blob type. This type can be used in areas where a byte slice is used to store a TLV value, which may be a fully opaque nested TLV.

tlv/record.go

@@ -17,6 +17,10 @@ type Type uint64
 // slice containing the encoded data.
 type TypeMap map[Type][]byte
 
+// Blob is a type alias for a byte slice. It's used to indicate that a slice of
+// bytes is actually an encoded TLV stream.
+type Blob = []byte
+
 // Encoder is a signature for methods that can encode TLV values. An error
 // should be returned if the Encoder cannot support the underlying type of val.
 // The provided scratch buffer must be non-nil.