ranges: add some slot types

diff --git a/core/ranges/ranges.factor b/core/ranges/ranges.factor
index fea571afc0e1792234fcb9d8e16c067ad0ad1c2d..3f1e3d0bb69611bd04ef86b38155ca17703a709b 100644 (file)
--- a/core/ranges/ranges.factor
+++ b/core/ranges/ranges.factor
@@ -5,9 +5,9 @@ sequences.private ;
 IN: ranges
 
 TUPLE: range
-{ from read-only }
-{ length read-only }
-{ step read-only } ;
+{ from number read-only }
+{ length integer read-only }
+{ step number read-only } ;
 
 <PRIVATE