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====== V2 ======
V2(2 3) ->vector

===== Description =====
Pops two items from the stack, treats them as float, and creates a new Vector and pushes it to the stack.  The two values popped from the
stack occupy the x and y positions in the new vector.  The z and w positions will be zero.

===== Examples =====
<code 4rpl>
V2(2 3) ->vector
trace(<-vector)
</code>