`fit.model_spec()` and `fit_xy.model_spec()` signature

[DavisVaughan]

Why are we using the following signatures?

args(parsnip::fit.model_spec)
#> function (object, formula = NULL, data = NULL, control = fit_control(), 
#>     ...) 
#> NULL

args(parsnip::fit_xy.model_spec)
#> function (object, x = NULL, y = NULL, control = fit_control(), 
#>     ...) 
#> NULL

From what I can tell, these are required arguments, not optional, so they should not be given default values.

[github-actions]

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