Tab order for number ranges not ok

When using numberrange.ftl in a form, tabbing through the form's fields is not natural. The cursor does not jump to the second field of the range, but to the next property in the form.

 
The problem lies in the tabIndex attribute of

<input id="${controlId}-max" name="-" type="text" class="number" <#if field.description??>title="${field.description}"</#if> tabindex="1" />

Value should be 0, not 1