What should I look out for when upgrading?

[Fairlight]

Y'all catch dis heeyah?  Kenneth Brody been jivin' 'bout like:
> 
> ... on the same file at the same time.  You can go back and forth
> between 5.6 and pre-5.6, or use 5.6 on one file and pre-5.6 on
> another, without issue.

I thought indexes were changed in 5.6, and you couldn't if you did
something with the new indexes.  Or maybe it was just if you were making
use of the extra indexes.  I know someone had to make some changes to
processing to be able to roll back to 5.0.14 to test something that was
cropping up in 5.6.  They told me indexes had been changed, but I don't
know if that was a substantive or quantitative change, or both.

mark->
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