. in predictor variable name causes errors

[jebyrnes]

dat <- tibble(x.x = 1:10,
              y = rnorm(x.x)) %>%
  as.data.frame()

mod <- lm(y ~ x.x, data = dat)

a <- qi_builder(mod,
                newdata = dat,
                slim = FALSE,
                ci = 1
                )

Causes the error

Error in possible_interaction_terms(fitted_names, n = k) : 
  Number of possible interaction terms cannot exceed number of base terms.

If I replace the . with a _, the error goes away.