type: int, default: <shape default> (nodes) , 1 (clusters) , minimum: 0
Note that user-defined shapes are treated as a form of box shape, so the default peripheries value is 1 and the user-defined shape will be drawn in a bounding rectangle. Setting peripheries=0 will turn this off.
peripheries=1 is the maximum value for clusters.
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attrs/peripheries/