D3 Examples - axis minor tickSize bug

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<!DOCTYPE html>
<meta charset="utf-8">
<head>
<style>
​
.axis path,line {
    stroke: #000;
    fill:   none;
}
​
.axis text {
    fill:   #000;
}
​
​
</style>
<script src="https://d3js.org/d3.v3.min.js"></script>
</head>
<body>
<svg width='400px' height='400px'>
​
<script>
​
var sc = d3.scale.linear().range([50,350]);
​
var ax1 = d3.svg.axis()
    .scale(sc)
    .tickSubdivide(1)
    .tickSize(10, 5);
​
var lb1 = d3.select('svg').append('g')
    .attr('transform', 'translate(0,100)')
    .classed('axis', true)
    .call(ax1);
​
var ax2 = d3.svg.axis()
    .scale(sc)
    .tickSubdivide(1)
    .tickSize(10, 5, 0);
​
var lb2 = d3.select('svg').append('g')
    .attr('transform', 'translate(0,200)')
    .classed('axis', true)
    .call(ax2);
​
</script>
​
</body>
​
    