Unable to use procs for nested properties

[mhuggins]

Hi there! Thanks for creating this gem. I'm trying to reuse title & description for twitter title & description, but not having any luck. I tried both:

= metamagic site: 'My Site',
            title: [:title, :site],
            separator: ' | ',
            description: 'Default description...',
            twitter: { card: 'summary', title: -> { title }, description: -> { description } }

and:

= metamagic site: 'My Site',
            title: [:title, :site],
            separator: ' | ',
            description: 'Default description...',
            twitter: { card: 'summary', title: [:title], description: [:description] }

Unfortunately neither the twitter:title nor twitter:description are rendered.

[jonn]

Just ran into the same trying to set og:title without duplicating in every meta call.

[imgarylai]

I got same issue.