const rsc.io/qr/coding.Extra

3 uses

	rsc.io/qr/coding (current package)
		qr.go#L268: 	Extra
		qr.go#L724: 		rem[i] = Extra.Pixel()
		qr.go#L758: 			if r := pix.Role(); (r == Data || r == Check || r == Extra) && p.Mask.Invert(y, x) {

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