true and false represent now proper boolean values, not just 0 and 1. All other previous arithmetic holds.

docs/scarpet/language/LoopsAndHigherOrderFunctions.md

@@ -124,12 +124,12 @@ to `all(list,expr) <=> for(list,expr)==length(list)`. `expr` also receives bound
 and `continue` have no sense and cannot be used inside of `expr` body.
 
 <pre>
-all([1,2,3], check_prime(_))  => 1
-all(neighbours(x,y,z), _=='stone')  => 1 // if all neighbours of [x, y, z] are stone
-map(filter(rect(0,4,0,1000,0,1000), l(x,y,z)=pos(_); all(rect(x,y,z,1,0,1),_=='bedrock') ), pos(_) )
+all([1,2,3], check_prime(_))  => true
+all(neighbours(x,y,z), _=='stone')  => true // if all neighbours of [x, y, z] are stone
+map(filter(rect(0,4,0,1000,0,1000), [x,y,z]=pos(_); all(rect(x,y,z,1,0,1),_=='bedrock') ), pos(_) )
   => [[-298, 4, -703], [-287, 4, -156], [-269, 4, 104], [242, 4, 250], [-159, 4, 335], [-208, 4, 416], [-510, 4, 546], [376, 4, 806]]
     // find all 3x3 bedrock structures in the top bedrock layer
-map( filter( rect(0,4,0,1000,1,1000,1000,0,1000), l(x,y,z)=pos(_);
+map( filter( rect(0,4,0,1000,1,1000,1000,0,1000), [x,y,z]=pos(_);
         all(rect(x,y,z,1,0,1),_=='bedrock') && for(rect(x,y-1,z,1,1,1,1,0,1),_=='bedrock')<8),
    pos(_) )  => [[343, 3, -642], [153, 3, -285], [674, 3, 167], [-710, 3, 398]]
     // ditto, but requiring at most 7 bedrock block in the 18 blocks below them