P: SDK: photo:getRawMetadata ("stackPositionInFolder") returns a string, not a number
In LR 10.1, photo:getRawMetadata ("stackPositionInFolder") returns a string, not a number, when the photo isn't a member of a folder stack, breaking my popular Any Filter plugin:

That string, "---0", has the pattern of strings used by 10.1 to record the custom-order positions of photos with collections and folders, so very likely this bug is fallout from the fix to custom-order position in 10.0 and 10.1:
