Is the as_map function supported?

I was wondering if the WDL as_map function is a supported function? I notice an implementation was committed to the Cromwell GitHub (commit #3895 - sorry I'm not yet allowed to post links), however, when I run the womtool validate command on a WDL file containing the function, I get the message "wdl.draft2.model.expression.WdlStandardLibraryFunctionsType.as_map(scala.collection.Seq)".
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