Trying to unnest broom::augment data, but R “can't cast”

问题

I can't reproduce the data here, but I'm hoping I'm making an obvious mistake. I am trying to get residuals from all the of the models I fit with purrr::map. My code looks like this:

  df %>%
  group_by(group) %>%
  nest() %>%
  mutate(model = map(data, fit_mod),
         model_data = map(model, broom::augment)) %>%
  ungroup()%>%
  unnest(c(data, model_data))

I get an error related to the title of one of the coefficients in my model:

Error: Can't cast model_data$poly.Actual_Population..2..raw...TRUE. to model_data$poly.Actual_Population..2..raw...TRUE. .

How can I just pull those residuals out of there? I want to check my models.

来源：https://stackoverflow.com/questions/58531385/trying-to-unnest-broomaugment-data-but-r-cant-cast