I can see that pry was made then pry-byebug, then byebug

pry initial commit is dec 2010 https://github.com/pry/pry/commits/master?after=f87764d8c2d532e6e5c78c9e0a7f1c7716187ae9+3884


pry-byebug initial commit is june 2012 https://github.com/deivid-rodriguez/pry-byebug/commits/master?before=283357cb5837022096373851950a69b37f0a4f8a+455

byebug initial commit is march 2013 https://github.com/deivid-rodriguez/byebug/commits/master?after=af25ece0b5a43fd857d19a45206653d0c402cd10+2659


I can guess that pry-byebug is meant to be an improvement of pry's debugging.

Is byebug meant to be an improvement on pry-byebug ? If not, why was it developed after?

Thanks

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