Make theme
a function instead of an object when passed to config closures
#774
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Previously we were passing the current theme object to lazily evaluated config closures, but this can lead to an unfortunate amount of boilerplate if you need to check for the presence of a given key before referencing it.
This PR makes theme a function instead, where you specify the path to look up as the first argument (using dot notation), and specify a default value if that path doesn't exist as a second argument, just like the
theme
function available in your CSS .Resolves #770.