Missing values not supported in `summary_rows()`?

[eutwt]

It looks like a summary row value can't be missing, even though missing values are displayed correctly (without error or warning) as part of a normal column. Is this known/expected?

library(gt)

example <- gt(data.frame(a = c(1, NA, 3)))

summary_rows(example, columns = a, fns = list(~ sum(.)))
#> Error: Problem with `mutate()` column `a`.
#> ℹ `a = (function (x) ...`.
#> ℹ `a` must be size 1, not 0.

^{Created on 2021-08-19 by the reprex package (v2.0.1)}

[rich-iannone]

This is definitely not something I'm happy with and I do think it's a bug. Workaround is to use summary_rows(example, columns = a, fns = list(~ sum(., na.rm = TRUE))) but it's not ideal. Thanks for reporting this.