in src/codecs/field_codecs.h [132:146]
inline void encode(PyObject *field_value, DxApi::DataWriter &writer) {
bool type_mismatch = false;
bool exists = getStringValue(field_value, buffer_, type_mismatch);
if (type_mismatch)
THROW_EXCEPTION("Wrong type of field '%s'. Required: STRING.", field_name_.c_str());
if (exists) {
writer.writeAlphanumeric(field_size_, buffer_);
} else {
if (!is_nullable_) {
THROW_EXCEPTION("Field '%s' is not nullable.", field_name_.c_str());
}
writer.writeAlphanumericNull(field_size_);
}
}