Users map read/write is racy
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llmII commented
https://github.com/qaisjp/go-ircevent/blob/e71f5fec2a8d3b9976a19b5e03e66aebd7168ff6/irc_nicktrack.go
The Users map could be read to and written to simultaneously if there are a bunch of simultaneous nick changes leading to a crash in external code relying on the map to determine things.
See the partial crash log at:
qaisjp/go-discord-irc#72