Handle JSON.stringify(undefined)
#1783
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Turns out that `JSON.stringify(undefined)` doesn't actually return a string, it returns `undefined`! If we're requested to serialize `undefined` into JSON instead just interpret it as `null` which should have the expected semantics of serving as a placeholder for `None`. Closes rustwasm#1778
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Turns out that
JSON.stringify(undefined)doesn't actually return astring, it returns
undefined! If we're requested to serializeundefinedinto JSON instead just interpret it asnullwhich shouldhave the expected semantics of serving as a placeholder for
None.Closes #1778