Structs are sent as a sequence of (field number, field value) pairs. The field
value is sent using the standard gob encoding for its type, recursively. If a
-field has the zero value for its type (except for arrays; see above), it is omitted
-from the transmission. The field number is defined by the type of the encoded
-struct: the first field of the encoded type is field 0, the second is field 1,
-etc. When encoding a value, the field numbers are delta encoded for efficiency
-and the fields are always sent in order of increasing field number; the deltas are
-therefore unsigned. The initialization for the delta encoding sets the field
-number to -1, so an unsigned integer field 0 with value 7 is transmitted as unsigned
-delta = 1, unsigned value = 7 or (01 07). Finally, after all the fields have been
-sent a terminating mark denotes the end of the struct. That mark is a delta=0
-value, which has representation (00).
+field has the zero value for its type (except for arrays; see above) or it's a
+pointer to a zero value, it is omitted from the transmission. The field number
+is defined by the type of the encoded struct: the first field of the encoded type
+is field 0, the second is field 1, etc. When encoding a value, the field numbers
+are delta encoded for efficiency and the fields are always sent in order of
+increasing field number; the deltas are therefore unsigned. The initialization
+for the delta encoding sets the field number to -1, so an unsigned integer field 0
+with value 7 is transmitted as unsigned delta = 1, unsigned value = 7 or (01 07).
+Finally, after all the fields have been sent a terminating mark denotes the end
+of the struct. That mark is a delta=0 value, which has representation (00).
Interface types are not checked for compatibility; all interface types are
treated, for transmission, as members of a single "interface" type, analogous to