This is an identity sub-scale for the thickness aesthetic
in ggdist. It returns its input as a thickness vector without
rescaling. It can be used with the subscale parameter of
geom_slabinterval().
subscale_identity(x)<numeric> Vector to be rescaled.
Typically provided automatically by geom_slabinterval().
A thickness vector of the same length as x, with infinite
values in x squished into the data range.
Other sub-scales:
subscale_thickness()