Show significant but constant digits in a different color

[krlmlr]

Example: lat-lon of a local area, years, years and months in dates varying by days, strings with a common prefix, ...

Should simply look at the decimal/textual representation and check:

1. If sign different, abort
2. If leftmost digit different anywhere, abort
3. Else, highlight and proceed with the next digit

How should the significant-but-constant digits be formatted?

Because this heuristic seems to be valid not only for numbers, but also dates, hms, strings, ..., maybe we need a generic helper.

Reference: tidyverse/tibble#305 (comment)

[hadley]

We should consider a similar algorithm for column names so that averylongcolumnname1 and averylongcolumnname2 get truncated to avery...1 and avery...2.

[AmeliaMN]

+1 When I was teaching at RStudio conf, about half my "Intro to R and RStudio" class saw pillar highlighting (long story) and they were very confused about why it was 2012 when you really care about 2012 or 2012 with dates.

[krlmlr]

For now, subtle highlighting is turned off by default for numbers. We clearly need to look at the available literature (#99).

[github-actions]

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