Null default float parameters?

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Function Vec3:TVec3(x#=0.0,y#=0.0/0.0,z#=0.0/0.0)
	Local t:TVec2=New TVec2
	If IsNan(y) y=x
	If IsNan(z) z=y
	t.x=x
	t.y=y
	t.z=z
	Return t
EndFunction