yui/yui3 — comment on commit 5c18c84bb57ad5d48f9701627052f25abd4629c1
File: src/pjax/js/pjax.js line 120
By ericf:

Curious why `pjax=1` was chosen and hardcoded? Also, are you adding a value for the param to limit the likelihood that a broken server doesn't barf on valueless query params, or for some other reason?

I would have expected this to be configurable, so a developer could set it something else.