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What is the result of requesting the length of an optional array?

LeeTL1220LeeTL1220 Arlington, MAMember, Broadie, Dev ✭✭✭
Boolean? run_orientation_bias_filter
Array[String]? artifact_modes
Boolean run_ob_filter = select_first([run_orientation_bias_filter, true]) && (length(artifact_modes) > 0)

What will length(artifact_modes) resolve to when artifact modes is not defined?


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