Usage of yyjsonr

[AbrJA]

Hi @dselivanov, I hope you are doing well,

I know you use jsonlite in this package, there is a new library to work with json format yyjsonr and it seems to be way faster than jsonlite. I don't know if you consider a good idea to try to replace the usage of jsonlite in your package where it's possible.

Best regards,

Abraham JA