twitter/bootstrap — comment on commit 5ad5dde1e24f668cf9b720dd59fc2a7d4808c0b3
File:  line 0
By fat:

I removed 13-24 because this wasn't the right solution. It forced the majority of people (who only want 12 columns) to have all this extra code. Also, it didn't explicitly work as the container var wasn't set for 24. so was calculating things incorrectly.

Instead, I've written custom column support into the builder and it will be released with 2.0.2. Because less is declarative there is no way to do this inside the less itself, and the solution needed to be moved into the builder.