ctype
NOTE: ctype is deprecated. Use features.(pb.cpp).string_type instead. The ctype option instructs the C++ code generator to use a different representation of the field than it normally would. See the specific options below. This option is only implemented to support use of ctype=CORD and ctype=STRING (the default) on non-repeated fields of type "bytes" in the open source release. TODO: make ctype actually deprecated.