[x] We probably want to pass these as strings, otherwise we'd need to make a converter from some Python units package. Also astropy doesn't allow you to have different units in the same numpy array, so seems perhaps not optimal for this.
[x] X_units and y_units parameters to .fit()?
[x] Add print_precision parameter.
[x] Add dimensional_constraints_penalty
[ ] Consider taking advantage of v_dim_out parameter.
[ ] Reach 100% diff coverage (see todo in tests file)
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