Update: July 26, 2019
This section of the forum is now closed; we are working on a new support model for WDL that we will share here shortly. For Cromwell-specific issues, see the Cromwell docs and post questions on Github.

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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