Characters show up that aren't in white list

[dxclancy]

For instance, i whitelist digits only, but still get some letters in string output.

Perhaps there was no confidence of any digit?
[SwiftOCR.SwiftOCRRecognizedBlob(charactersWithConfidence: [("3", 0.500555277), ("7", 0.0274531413)], boundingBox: (6.0, 6.0, 21.0, 29.0)), SwiftOCR.SwiftOCRRecognizedBlob(charactersWithConfidence: [], boundingBox: (29.0, 7.0, 10.0, 27.0)), SwiftOCR.SwiftOCRRecognizedBlob(charactersWithConfidence: [("6", 0.083129324)], boundingBox: (44.0, 5.0, 23.0, 29.0)), SwiftOCR.SwiftOCRRecognizedBlob(charactersWithConfidence: [("2", 0.25452441)], boundingBox: (81.0, 6.0, 20.0, 28.0)), SwiftOCR.SwiftOCRRecognizedBlob(charactersWithConfidence: [("3", 0.500555277), ("7", 0.0274531413)], boundingBox: (105.0, 6.0, 21.0, 29.0)), SwiftOCR.SwiftOCRRecognizedBlob(charactersWithConfidence: [("5", 0.0765574574), ("9", 0.066627048)], boundingBox: (129.0, 6.0, 20.0, 29.0))]
The sting returned was "3IE23" (actual 316235)
Actually looking at the output here, I guess the issue is the confidence is lower than .1, so it still chose the letters?