How to cast a reflect.Value by its type when created by reflect.New

I'm actually trying some black magic using reflection in golang :P

I got something like this :

  var _int int
  var _int32 int32
  var _int64 int64
  var _string string

    var nilablesIndex map[int]reflect.Value
    var nilables = map[string]reflect.Type {
           "int32":     reflect.TypeOf(_int32)},
           "int64":     reflect.TypeOf(_int64)},
           "int":       reflect.TypeOf(_int)},
           "string":    reflect.TypeOf(_string)},
        }
nilablesIndex[len(m) - 1] = reflect.New(nilables[field.Type.String()][1])

To summarize, I have at this moment a reflect.Value created by reflect.New(nilables[field.Type.String()][1])

That I want is to cast this variable by its original type.

Example : If nilablesIndex[0] is a reflect.Type int32, I want to cast it to type int32.

Is it possible ?

Thank you :)