Ionic-native/file issue

Using the latest @ionic-native/file I’m getting back a value I don’t understand:

filesystem:FileSystem {name: "files", root: DirectoryEntry}
fullPath:"/1511859565798.jpg"
isDirectory:false
isFile:true
name:"1511859565798.jpg"
nativeURL:"file:///data/user/0/net.xxx.yyy/files/1511859565798.jpg"
__proto__:Entry {constructor: , createWriter: , file: }

How can the file be both a root dir entry, and have a nativeURL like that? Is it something to do with running in dev mode…?

Thanks in anticipation.

BTW, the docs link to GitHub, which says to report issues via the Cordova tracker, but that leads to a page with an error message, “The value ‘Plugin File’ does not exist for the field ‘component’.”