Allow non-numeric data as input

[jeffreypullin]

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Currently, we demand that all data be numeric - we should relax this to allow for, factors and character vectors etc. The key difficulty of this is how to present the input data in the output.

See discussion in #75 and compare with #70

[jeffreypullin]

One of the key questions here is how we would label the returned the parameters with the non-numeric input

[Agasax]

Just an amateur suggestion, sorry if I'm way off, but would the function recover_types from tidybayes be something to look into?

[jeffreypullin]

@Agasax Did you find the need to convert everything to numeric a big limitation in your use of {rater}? Implementing non-numeric input is feasible but it would be a lot of work so I'm considering whether it is worth it atm. I'd love to hear your thoughts!

[Agasax]

Sorry for slow response here. The issue was not providing the data in numerical form, but rather not having the factor levels conserved when using the plotting functions of you get my meaning. I hope to try it out again this weekend, will get back to you.

[jeffreypullin]

All good! Yes, that's what I meant really 😄

[jeffreypullin]

Unfortunately this isn't going to make it into the 1.1 release, but I'm going to add it into the 1.2 milestone so that I remember to work on it soon.