options to save cfs other than json format when categorical variables are in float format

[Bora-ds]

Hi. Could you add another option or method to save counterfactuals? to_json() method doesn't work when all the variables are categorical and they are in float format. (given the message, it seems like it's JSON serialize issue)

or could you suggest simple code examples to save counterfactual list in any human-readable format other than json object?