I don't know if it is a bug or intended, but it caused me some loss of time
: the <1, 0, 0> + 0.5*t  yields <1, 0, 0, 0> and not <1, 0, 0, 0.5> as
expected (by me!). (This happens whatever the number at the place of 0.5)
Additions <1, 0, 0> + t, <1, 0, 0> + t*1, or 1*t + <1, 0, 0> yield <1, 0, 0,
1>!

#macro V4Show(S, V)
#debug concat(S, ": ", str(V.x,6,2), ", ", str(V.y,6,2), ", ",str(V.z,6,2),
", ",str(V.t,6,2), "\n")
#end

#declare vvv = <1, 0, 0> +1*t;
V4Show("vvv ",vvv)

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