isRequired: false doesn't work with scope: 'path' in Swagger UI

[metasection]

We are using scope: 'path" because we like the way the URL's are formatted. Very "Resty"!

When the fields are set to scope: 'query' our GET works fine with Swagger UI.

When the optional fields (isRequired: false) are set to scope: 'path' a Javascript error occurs in the Swagger UI. Please see the following screen shot.

"filter is a required path param"

Here is a screen shot of the Swagger UI showing the fields.

Here is the definition of my route.

server.get({url: '/billing/event/:limit/:page/:sort',
  swagger: {
    summary: 'Get the billing events',
    notes: '',
    nickname: 'getBillingEvents'
  },
  validation: {
    limit: { isRequired: true, description: 'Row return limit', swaggerType: 'integer', scope: 'path' },
    page: { isRequired: true, description: 'Page number', swaggerType: 'integer', scope: 'path' },
    sort: { isRequired: true, description: 'Sort by field name', swaggerType: 'string', scope: 'path' },
    filter: { isRequired: false, description: 'Customer tag filter', swaggerType: 'string', scope: 'path' }
  }}, require('./api/billing_event').getBillingEvents);

We have played around with adding the "/:filter" to the url and changing various options in the validators.

I took a peak at the module source code. There is a lot of good code in there. My wild guess is that _pushPathParameters may need a fix. It doesn't take into consideration the isRequired option. Just a guess.

[metasection]

Just retest this. Still broken. Guidance?