See Wikipedia: Double-precision floating-point format.
double is a valid type for: area arrowsize Damping defaultdist distortion dpi epsilon fontsize height inputscale K labelangle labeldistance labelfontsize len levelsgap lheight lwidth margin mclimit mindist nodesep normalize nslimit nslimit1 orientation overlap_scaling pad page penwidth quantum ranksep ratio repulsiveforce resolution rotation scale size skew voro_margin weight width z
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https://www.graphviz.org/docs/attr-types/double/