This PR adds methods to Listing and Mapping that can be used to retrieve members. If the member for the index/key isn't present, it applies default to the index/key. In both cases, this is essentially sugar for getOrNull(<index/key>) ?? default.apply(<index/key>).
Co-authored-by: Daniel Chao <daniel.h.chao@gmail.com>
Jen BaschandDaniel Chao
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