Add some comments to better set the context

examples/vallie/vallie.go

@@ -1,3 +1,8 @@
+// Package vallie stands in for a stand-alone validation library
+// purely for discussion purposes.
+//
+// Assuming this is a desired approach, more fidelity will be added
+// and vallie would be extracted into it's own repo
 package vallie
 
 import (
@@ -10,6 +15,10 @@ var errZeroVal = errors.New("Object is a zero value")
 
 // Validate accepts objects to be validated from constructor and returns an error
 // if any of the provided object is a zero value object
+//
+// TODO: if Validate returns an error, how can we hook into the dig resolution
+// cycle to produce a meaningful error message, i.e.
+// "failed to resolve Type3, because non-optional Type2 is not registered"
 func Validate(values ...interface{}) error {
 	for _, val := range values {
 		v := reflect.ValueOf(val)