Add tests for '#' on collections

test/arrays.tm

@@ -9,6 +9,9 @@
 >> arr[-1]
 = 30
 
+>> #arr
+= 3
+
 sum := 0
 for x in arr
 	sum += x

test/tables.tm

@@ -1,12 +1,16 @@
 
 >> t := {"one"=>1, "two"=>2; default=999}
 = {"one"=>1, "two"=>2; default=999}
+
 >> t["one"]
 = 1
 >> t["two"]
 = 2
 >> t["???"]
 = 999
+
+>> #t
+= 2
 >> t.default
 = ?(readonly)999
 >> t.fallback
@@ -19,12 +23,16 @@
 
 >> t2 := {"three"=>3; fallback=t}
 = {"three"=>3; fallback={"one"=>1, "two"=>2; default=999}}
+
 >> t2["one"]
 = 1
 >> t2["three"]
 = 3
 >> t2["???"]
 = 999
+
+>> #t2
+= 1
 >> t2.default
 = !Int64
 >> t2.fallback