V2: Return zero values from ReflectMessage.get #813
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This changes the behavior of
ReflectMessageto never returnundefinedwithget(). For unset fields, we return the zero value instead.This simplifies call-sites, since they do not have to check for
undefinedanymore, even if the code path is guarded by a call toisSet().Besides this change of behavior, this also adds JSDoc for
ReflectMessage,ReflectList,ReflectMap,isFieldSet, and a few others.