🐛 Check for Ractor (for JRuby, TruffleRuby) #453
Merged
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This is the same code I used in the
v0.4-stable
backport. I didn't use it in the main branch because the minimum ruby version is 3.1. But that breaks when JRuby and TruffleRuby try torequire "net/imap"
.Fixes #452.