In base R `signif()`

, halves are rounded to even, e.g.,
`signif(11.5, 2)`

and `signif(12.5, 2)`

are both rounded to 12.
This function rounds 12.5 to 13 (assuming `digits = 2`

). Negative halves
are rounded away from zero, e.g., `signif(-2.5, 1)`

is rounded to -3.

This may skew subsequent statistical analysis of the data, but may be
desirable in certain contexts. This function is implemented from
https://stackoverflow.com/a/1581007/; see that question and
comments for discussion of this issue.