When I change e.g. @gridColumns in preboot.less to e.g. 24 than still only span1 to span16 are generated.
I would expected that span17 to span24 would also be generated.

I noticed in scaffolding.less that these spans are hardcoded:

// Default columns
.span1 { .columns(1); }
.span2 { .columns(2); }
.span3 { .columns(3); }
.span4 { .columns(4); }
.span5 { .columns(5); }
.span6 { .columns(6); }
.span7 { .columns(7); }
.span8 { .columns(8); }
.span9 { .columns(9); }
.span10 { .columns(10); }
.span11 { .columns(11); }
.span12 { .columns(12); }
.span13 { .columns(13); }
.span14 { .columns(14); }
.span15 { .columns(15); }
.span16 { .columns(16); }

I don't know if it's possible to make this more dynamic as I'm new to less language.