h the FFI (and the RTS also calls <tt>malloc()</tt> itself in a few places).
</p>

<p>
When heap profiling is enabled, <span style="color: blue">blocks
size</span> and <span style="color: green">live bytes</span>
will typically differ by the size of the nursery.
For understanding the relationship between <span style="color: blue">blocks
size</span> and <span style="color: green">live bytes</span>,
this <a href="https://www.well-typed.com/blog/2021/03/memory-return/">blog
post</a> contains more information.<