"glob(path, pattern) not implemented yet"

Hi there,

I'm trying to run a wdl workflow using globs on Cromwell 3.6. A simple command like:

Array[File] input_bams = glob("*.bam")

Generates the following error:

[2019-01-07 15:53:42,52] [ESC[38;5;1merrorESC[0m] WorkflowManagerActor Workflow 4b6c7952-ad59-4ccd-8229-612590ab732b failed (during MaterializingWorkflowDescriptorState): cromwell.engine.workflow.lifecycle.materialization.MaterializeWorkflowDescriptorActor$$anon$1: Workflow input processing failed:
Failed to evaluate expression 'glob("*.bam")' (reason 1 of 1): glob(path, pattern) not implemented yet

What gives? I see a lot of threads suggesting this should work.