Preserve ex-data of all ex-info exceptions in the cause chain #61
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Instead of only adding ex-data of the top-level exception into the extra map, walk down the cause chain and add all ex-data encountered therein. To prevent them from clobbering each other or any keys already present in the extra map, nest all ex-data under separate keys. The top-level exception's ex-data is added under "ex-data" while causes are added under
"ex-data, cause <n>: <message>"
where<n>
is the cause's position in the chain and<message>
is its message.