/libs/cq/config/rewriter/default (transformer, Output Rewriting Pipelines) have property order as -1 (as per the document value can be 0 or >0)

As per the sling.apache.org document (https://sling.apache.org/documentation/bundles/output-rewriting-pipelines-org-apache-sling-rewriter.html) for "Output Rewriting Pipelines" the order property value of the transformer can only be 0 or >0.

But in AEM default pipeline is having order property as -1 (here is the location: /libs/cq/config/rewriter/default).

if somebody have the information regarding order as -1?

thanks