Having identical titles leads to identical ids and anchors

Hmm no, the anchors are getting unique name attributes

# Heading level A
foo

## Heading level B
bar

## Heading level B
bar

# Heading level A
foo

## Heading level B
bar

## Heading level B
bar

generates: (note the -1 -2 -3 etc)

<h1 dir="ltr">
  <a name="heading-level-a-1" class="anchor" href="#heading-level-a-1"></a>Heading level A
</h1>
<p dir="ltr">foo</p>
<h2 dir="ltr">
  <a name="heading-level-b-2" class="anchor" href="#heading-level-b-2"></a>Heading level B
</h2>
<p dir="ltr">bar</p>
<h2 dir="ltr">
  <a name="heading-level-b-3" class="anchor" href="#heading-level-b-3"></a>Heading level B
</h2>
<p dir="ltr">bar</p>
<h1 dir="ltr">
  <a name="heading-level-a-4" class="anchor" href="#heading-level-a-4"></a>Heading level A
</h1>
<p dir="ltr">foo</p>
<h2 dir="ltr">
  <a name="heading-level-b-5" class="anchor" href="#heading-level-b-5"></a>Heading level B
</h2>
<p dir="ltr">bar</p>
<h2 dir="ltr">
  <a name="heading-level-b-6" class="anchor" href="#heading-level-b-6"></a>Heading level B
</h2>
<p dir="ltr">bar</p>