header.go
func (t *TupleHeader) Size() int {
	return VersionOneTupleHeaderSize + int(t.FieldSize)*int(t.FieldCount)
}
func (t *TupleHeader) Size() int {
	return VersionOneTupleHeaderSize + int(t.FieldSize)*int(t.FieldCount)
}
// Size returns the Version 1 header size plus the size of all the offsets