var Union = require('lib-union')()
var union = Union.New();
// place default values
union.set('name', 'bob')
union.set('age', 20)
// insert a new writable layer
union.push()
union.set('name', 'tom')
// get values
union.get('name') // tom
// remove top layer
union.pop()
union.get('name') // bob
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