rclnodejs: Unit tests fail on Node.js v14.x and v15.x - Check failed: result.second.

When using the latest Node.js LTS Fermium v14.15.0, the unit test began to fail consistently and it also reproduces on v15.x versions. Backtrace is

#
# Fatal error in , line 0
# Check failed: result.second.
#
#
#
#FailureMessage Object: 0x7fff04fd3a70
 1: 0xa70141  [node]
 2: 0x19cf084 V8_Fatal(char const*, ...) [node]
 3: 0xe594c9 v8::internal::GlobalBackingStoreRegistry::Register(std::shared_ptr<v8::internal::BackingStore>) [node]
 4: 0xba4a18 v8::ArrayBuffer::GetBackingStore() [node]
 5: 0x9c18f0 napi_get_typedarray_info [node]
 6: 0x7fa130ce70ef  [/root/rclnodejs/node_modules/ref-napi/prebuilds/linux-x64/node.napi.node]
 7: 0x7fa130ce7918  [/root/rclnodejs/node_modules/ref-napi/prebuilds/linux-x64/node.napi.node]
 8: 0x7fa130ce7bbb  [/root/rclnodejs/node_modules/ref-napi/prebuilds/linux-x64/node.napi.node]
 9: 0x7fa130cefceb Napi::details::CallbackData<void (*)(Napi::CallbackInfo const&), void>::Wrapper(napi_env__*, napi_callback_info__*) [/root/rclnodejs/node_modules/ref-napi/prebuilds/linux-x64/node.napi.node]

and the corresponding PR #716