I wonder if somebody can explain the following behaviour:

//Return 0 if not parallel, 1 if parallel, -1 if anti-parallel
#macro t_parallel(V1i,V2i)
    #local V1=vnormalize(V1i);
    #local V2=vnormalize(V2i);
    #local Vt=vlength(V1+V2)-1;
    #if(abs(Vt)=1) Vt
    #else 0
    #end
#end

//this works:
#debug concat("Parallel is ",str(t_parallel(y,x),0,3),"\n")

//this returns an error:
#if(t_parallel(y,x)=1|t_parallel(y,x)=-1)
#debug "Parallel or anti-parallel\n"
#else
#debug "Not parallel\n"
#end

//this works:
#if(abs(t_parallel(y,x))=1)
#debug "Parallel or anti-parallel\n"
#else
#debug "Not parallel\n"
#end

//this also works, but _only_ when there is no semi-colon after the float
declaration

#declare A=t_parallel(y,x) //no semi-colon!
#if(A=1|A=-1)
#debug "Parallel or anti-parallel\n"
#else
#debug "Not parallel\n"
#end

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