Apparently some versions of readline for OSX cause IRB to block thread-passing while it's waiting for user input at the prompt.
If you're experiencing problems live coding in IRB, such as starting the Diamond arpeggiator and nothing happening, it could be because of this. Unfortunately, as far as I know, the only way to fix it is to disable readline. You can do this by adding this line to ~/.irbrc
IRB.conf[:USE_READLINE] = false
This is annoying, because then you'll no longer have the ability to recall previously used commands and things like that. I've been meaning to get text editor based live coding up and running so maybe this is the time
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