Nothing
x <- c(1, 2, 3); v <- c(1, 1, 1)
project(x, v)
dot(x, v) * v / vlength(v)^2
project(x, v, type = 'coef')
dot(x, v) / vlength(v)^2
project(x, v, type = 'length')
dot(x, v) / vlength(v)
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