What should be degree of freedom for a categorical variables in penalized splines?

I am using a categorical variable with two categories i.e.

coldspell 0  1
          No Yes

I am using this variable in penalized splines. What should be the degree of freedom for this variable?

Thanks



Read more here: https://stackoverflow.com/questions/67396494/what-should-be-degree-of-freedom-for-a-categorical-variables-in-penalized-spline

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