microdot: HTML multiple dropdown list returns only the last selected value

Hi again, I’ve noticed that HTML select/options list with multiple selection returns only the last selected value in the request.form:

<form method="POST" action="">
<p>
<i class="bi bi-calendar-day"></i>
<label for="weekdays">days:</label>&nbsp;&nbsp;
<select class="form-select" name="weekdays" id="weekdays" multiple>
<option value="" selected hidden disabled>change</option>
<option value="0">Monday</option>
<option value="1">Tuesday</option>
<option value="2">Wednesday</option>
<option value="3">Thursday</option>
<option value="4">Friday</option>
<option value="5">Saturday</option>
<option value="6">Sunday</option>
</select></p>
<button type="submit" name="settings" value="save" class="btn btn-primary">
</form>

Is this an expected/known behavior? Any hints on how to fix it? Thanks!