De-version Rational
Make stdlib say it wants same readline as ext/readline says it is.  Note, then -SNAPSHOT version it used was identical in content to the non-snahshot one it did not use so this was just an unfortunate configuration error.  installing a -SNAPSHOT version will make full deploys work.  Or you can just build from this commit and be ok
Remove compat from range and remove first/last with no ThreadContext arg from existing altogether