Trailing Fragment Space(s)

We have fragments that have a space at the end (outbound/22130600/po/powithspacetest%20). When trying to navigate to this fragment Backbone is stripping the trailing space in getFragment().

        var M = /^[#\/]|\s+$/g;

        getFragment: function(t) {
            if (t == null) {
                if (this._usePushState || !this._wantsHashChange) {
                    t = this.getPath()
                } else {
                    t = this.getHash()
                }
            }
            return t.replace(M, "")
        },

I can understand removing the bits at the start of the fragment, but can someone explain the motivation for removing the space(s) at the end? This causes our app to fail to lookup the requested data because the part with the space is a param in the router.

routes: {
                "": "home",
                "outbound/:tieBack/po/:poNbr": "outboundDetail"
            },

And

            outboundDetail: function(tieBack, poNbr) {
                app.switchOutboundDetail(tieBack, poNbr);
            },

Start at the getFragment entry point and inspect the M regular expression shown in the issue, then trace how the returned fragment reaches the outbound/:tieBack/po/:poNbr route. Confirm the expected behavior for a trailing-space parameter and add coverage demonstrating that the router receives the intended value without breaking existing fragment handling.