Mirror Modifier should flip normal map too - invert color channel of normal maps

Hi,

The mirror modifier will invert a texture, but since Normals are directional vectors, it doesn’t mirror it properly and extra work needs to be done. Shouldn’t one of the channels be inverted depending on the mirror direction? Where do I send a feature request?

Perhaps there is a way to use a geometry node to detect which side the geometry is on and flip my normals automatically? Thanks.