React-router: New version breaks router `replace`

[bayleedev]

Version

2.8.0

Test Case

http://jsbin.com/ciqurodeda/1/edit?html,js,output

Steps to reproduce

• Replace query with string: replace({ pathname: '/', query: { name: 'meow' } })

  Expected Behavior

• Assert name is in url once

• Assert value comes back as string meow

  Actual Behavior

• Assert name is in url twice

• Assert value comes back as array ['meow', 'meow']
  

  Additional Information

This behavior does not happen in 2.7.0 and is likely related to this line.

[taion]

Fixed in 2.8.1

[bayleedev]

Thanks!