Brodie Gaslam

@jimhester, bump... Any interest in pursuing this further?

Here is another example with [`ggproto` objects](https://codecov.io/gh/tidyverse/ggplot2/src/master/R/geom-rect.r):  Presumably rect_to_poly is called via the ggproto method on line 41. As always I'm happy to help with a PR if you'd...

Is there reason to believe that allowing full traversal by default becomes prohibitive?

I would suggest a warning for symmetry with: ``` > 1:2 + 1:3 [1] 2 4 4 Warning message: In 1:2 + 1:3 : longer object length is not a...

The particular use case that I have in mind is a REPL that runs in an interactive R session, as `browser()` does. The REPL simulates the standard R REPL, but...

I guess in my case the user sees an error and types `traceback()` in the mock REPL expecting to see the traceback. I could also intercept the `traceback()` call in...

Loosely related to #33

Be sure to update the docs for `?diffPrint`, particularly the "Matrices and Data Frames" section once this is done.

Maybe if we transition to `fansi`.

If you're diffing character vectors (which you seem to be based on your prior comments), and you're not married to seeing them displayed the way R prints them (i.e.: `[1]...