[Discussion] parse, toPlainJson, toPlainArray, toPlainMap, toPlainSet should not return undefined

[MatthiasKunnen]

Returning undefined instead of throwing an error is an old approach and quite annoying because it requires a !== undefined check or non-null assertion on every call.

I would like these methods to throw instead of returning undefined.

This will not change that, for example, array elements that fail to deserialize get substituted with undefined.

[MatthiasKunnen]

WIP: master...MatthiasKunnen:parser-no-undefined