1.23.1

test.js
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			var tape = require('tape')
			, caseless = require('./')
			;

			tape('set get has', function (t) {
			var headers = {}
			, c = caseless(headers)
			;
			t.plan(17)
			c.set('a-Header', 'asdf')
			t.equal(c.get('a-header'), 'asdf')
			t.equal(c.has('a-header'), 'a-Header')
			t.ok(!c.has('nothing'))
			// old bug where we used the wrong regex
			t.ok(!c.has('a-hea'))
			c.set('a-header', 'fdsa')
			t.equal(c.get('a-header'), 'fdsa')
			t.equal(c.get('a-Header'), 'fdsa')
			c.set('a-HEADER', 'more', false)
			t.equal(c.get('a-header'), 'fdsa,more')

			t.deepEqual(headers, {'a-Header': 'fdsa,more'})
			c.swap('a-HEADER')
			t.deepEqual(headers, {'a-HEADER': 'fdsa,more'})

			c.set('deleteme', 'foobar')
			t.ok(c.has('deleteme'))
			t.ok(c.del('deleteme'))
			t.notOk(c.has('deleteme'))
			t.notOk(c.has('idonotexist'))
			t.ok(c.del('idonotexist'))

			c.set('tva', 'test1')
			c.set('tva-header', 'test2')
			t.equal(c.has('tva'), 'tva')
			t.notOk(c.has('header'))

			t.equal(c.get('tva'), 'test1')

			})