parsing error for arrays of objects

package main

import (
	"fmt"

	"code.cloudfoundry.org/jsonry"
)

func main() {
	data := `{"nfs":[{"volume_mounts":[{"container_dir":"foo"}]}]}`

	var receiver struct {
		Paths []string `jsonry:"nfs.volume_mounts.container_dir"`
	}

	if err := jsonry.Unmarshal([]byte(data), &receiver); err != nil {
		panic(err)
	}

	fmt.Printf("%+v", receiver.Paths)
}

You'd expect this to extract the string foo, but it panics with:

panic: cannot unmarshal "[foo]" type "[]interface {}" into index 0 (type "string") path Paths[0]

Start by reproducing the example with jsonry.Unmarshal and trace how the nfs.volume_mounts.container_dir path is handled for arrays of objects. Done means the example completes without panicking and receiver.Paths contains the extracted string "foo".