Nathan Shively-Sanders b9efe3e700 Retain undefined in spreads w/strictNullChecks
Previously, both optional and `| undefined` caused spread properties to
combine with preceding properties and drop the `undefined`. Now, with
strictNullChecks, optional and `| undefined` properties still combine
with preceding properties but don't drop the `undefined`.
2017-05-18 13:57:24 -07:00
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