What am I doing wrong here - canFind with iota is not working

[Kingsley via Digitalmars-d]

float oneDegree = (PI / 180.0);
float first = -(oneDegree * 10.0);
float second = (oneDegree * 10.0);
float step = 0.000001;
float[] r = iota(first,second,step).array;

writeln(r);

float item = 0.174531;
writeln(r.canFind(item));


// returns false for canFind - even though that float is in the 
array ???