range now handles better long long chains, as well as float values.

docs/scarpet/language/Containers.md

@@ -215,6 +215,8 @@ map(range(10),_*_)  => [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
 reduce(range(10),_a+_, 0)  => 45
 range(5,10)  => [5, 6, 7, 8, 9]
 range(20, 10, -2)  => [20, 18, 16, 14, 12]
+range(-0.3, 0.3, 0.1)  => [-0.3, -0.2, -0.1, 0, 0.1, 0.2]
+range(0.3, -0.3, -0.1) => [0.3, 0.2, 0.1, -0, -0.1, -0.2]
 </pre>
 
 ## Map operations