OBJC_CLASS_PREFIX_FIELD_NUMBER
OPTIMIZE_FOR_FIELD_NUMBER
optionalCcGenericServices
optionalJavaGenerateEqualsAndHash
optionalJavaGenericServices
optionalJavaMultipleFiles
optionalJavaOuterClassname
optionalJavaStringCheckUtf8
optionalMessageSetWireFormat
optionalNoStandardDescriptorAccessor
optionalPyGenericServices