fixed-cidr-v6 Must be a string

[coodix]

Expected behavior

Config file should be applied without prompting any error

Actual behavior

Error ""fixed-cidr-v6" : Must be a string" is raised.

Information

Docker Version 17.07.0-ce-rc2-mac22 (18909)
Channel: edge
d9a9cf3b45

Steps to reproduce the behavior

1. Paste {"ipv6":true,"fixed-cidr-v6":"fd00:dead:beef::/48","debug":true,"experimental":true} into Preferences->Daemon->advanced input field

[docker-robott]

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[docker-robott]

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