Expression aesthetics (variables wrapped in functions or using prefix/infix
operators) need to be handled differently than just standalone variable
mpg) or dplyr-like variable calls (i.e.
A parse tree generated by
The reason it is advised wrap
x in a
list is due to the way
x will be indexed/subsetted. The
c function wrapping is
assumed, so therefore the
list wrapping is needed.
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