scale prop doesn't seem to be working in iOS

[MarkWissler]

The default scale for a given image seems to only work for me on android, but not iOS. I maybe misunderstanding something though:

<PhotoZoom
  source={{ uri: media.url }}
  minimumZoomScale={1}
  maximumZoomScale={2}
  scale={1}
  androidScaleType='fitXY'
  onLoad={noop}
  style={this.fullSizeStyle}
/>

Let me know if I need to provide more thorough repro steps and I'll be happy to do it. Thanks!