Catmandu::Fix::lookup_in_store - change the value of a HASH key or ARRAY index by looking up it's value in a store
lookup_in_store('foo.bar', 'MongoDB', '-bag', 'bars', '-database_name', 'lookups'); # using the default bag and a default value lookup_in_store('foo.bar', 'store_name', '-default', 'default value');