BSON: support objects with int32 members

include/nlohmann/detail/input/binary_reader.hpp

@@ -203,6 +203,16 @@ class binary_reader
                     sax->boolean(static_cast<bool>(get()));
                 }
                 break;
+                case 0x10: // int32
+                {
+                    string_t key;
+                    get_bson_cstr(key);
+                    sax->key(key);
+                    std::int32_t value;
+                    get_number_little_endian(value);
+                    sax->number_integer(static_cast<std::int32_t>(value));
+                }
+                break;
                 case 0x0A: // null
                 {
                     string_t key;