decodeImage -> decode_image #168

Job	Run time
industrial_ci (kilted, testing)	3m 42s
industrial_ci (humble, testing)	3m 29s
industrial_ci (jazzy, testing)	3m 36s
industrial_ci (rolling, testing)	4m 4s
industrial_ci (humble, main)	3m 41s
industrial_ci (kilted, main)	3m 34s
industrial_ci (jazzy, main)	4m 9s
industrial_ci (rolling, main)	4m 8s
	30m 23s

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