Add most of the type checkers

example/src/main.nub

@@ -9,10 +9,12 @@ export struct Human
 
 extern "main" func main(args: []cstring): i64
 {
-    let x: Human = {
-        name = "test"
+    let x = [1]Human
+
+    x[0] = {
+        name = "oliver"
     }
 
-    puts(x.name)
+    puts(x[0].name)
     return 0
 }