Styling by value does not work with boolean fields (Turbo-Carto* is not applied).
STYLE.FILL.BY VALUE and choose the boolean field. The expected result would be a categoric map, instead what is showing is a simple map (screenshot). 
*CartoCSS:
#layer {
marker-width: 7;
marker-fill: ramp([arrest], (#5B3F95, #1D6996), ("false", "true"));
marker-fill-opacity: 1;
marker-allow-overlap: true;
marker-line-width: 1;
marker-line-color: #FFF;
marker-line-opacity: 1;
}
Tested editing the CartoCSS by hand, and it doesn't either work with:
Is this still happening?
Yes, it is still happening.

S/B: 10679281
reproduced here.
we might need to prioritize this as a bug @jorgesancha
Prioritizing
PR: cartodb/turbo-carto#67
Deploy the tiler (windshaft-cartodb) branch fix_booleans_turbocarto and follow the STR that Ramiro write down here
Acceptance OK:

Ready in production
Great, thanks! @CartoDB/support I notified S/B 10679281 and 12242644.
Most helpful comment
Ready in production