Correctly remove values stored in the array-part of a table.

src/test/res/test8.lua

@@ -0,0 +1,12 @@
+t = {}
+t[1] = "foo"
+t[2] = "bah"
+print(t[1])
+print(t[2])
+print(t[3])
+
+t[1] = nil
+t[2] = nil
+print(t[1])
+print(t[2])
+print(t[3])