Witness this oddity (to me):

> rainbow_hcl(10)[1]
[1] "#E18E9E"
> d <- attributes(hex2RGB(rainbow_hcl(10)))$coords[1,]
> rgb(d[1], d[2], d[3])
[1] "#C54D5F"

What happened?  FYI, this came up as I'm trying to reuse the RGB values I
get from rainbow_hcl in a call to rgb() where I can also set alpha
transparency levels ...

-Aaron

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