How to pass '+' in query?

[thgh]

I'm trying to pass a phone number, it's getting rendered correctly server-side, but not client-side.
Cause:

sapper/runtime/src/app/app.ts

Line 101 in e0de230

value = (value || '').replace(/\+/g, ' ');

Repro: https://github.com/thgh/sapper-template/tree/repro-618

1. Go to /?phone=+1234
   Expected: $page.query.phone === '+1234'
   Actual: $page.query.phone === ' 1234'
2. Go to /?phone=%2B1234
   Expected: $page.query.phone === '+1234'
   Actual: $page.query.phone === ' 1234'