Inline conditional math not working as expected

[jstncmorgan]

Pug Version: 3.0.2

Node Version: 16.15.0

Pug is being rendered via express
The following two blocks of pug code give different results:

each page in paginatorPages
    li(class="page-item" class={"d-none d-sm-flex": page < currentPage - 1 || page > currentPage + 0})

each page in paginatorPages
    li(class="page-item" class={"d-none d-sm-flex": page < currentPage - 1 || page > currentPage})

The only difference is the + 0 near the end of the second line. My actual use case here is that I would like to check page > currentPage + 1, but through experimentation, I discovered that any addition operation in the back half of the second equation results in strange behavior. Resultant HTML is as follows where currentPage == 3 and paginatorPages == [1, 2, 3, 4, 5]:

<li class="page-item d-none d-sm-flex"></li>
<li class="page-item"></li>
<li class="page-item"></li>
<li class="page-item"></li>
<li class="page-item"></li>

<li class="page-item d-none d-sm-flex"></li>
<li class="page-item"></li>
<li class="page-item"></li>
<li class="page-item d-none d-sm-flex"></li>
<li class="page-item d-none d-sm-flex"></li>