I believe that in the table for top level items, the type given for default-features is wrong.
vcpkg seems to want an array of features instead of a bool.

Document Details

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• ID: c9908f8f-fc4a-6ba6-65a0-c4f16fc1621d
• Version Independent ID: c9908f8f-fc4a-6ba6-65a0-c4f16fc1621d
• Content: vcpkg.json Reference
• Content Source: vcpkg/reference/vcpkg-json.md
• Product: vcpkg
• GitHub Login: @ras0219-msft
• Microsoft Alias: roschuma