Commits on Oct 21, 2020

1. Document :mem_cache_store $MEMCACHE_SERVERS incompatibility …

   `:dalli_store` falls back to `$MEMCACHE_SERVERS` if no addresses are
   given, whereas (prior to Rails 6.1) `:mem_cache_store` goes straight to
   `localhost:11211`.
   
   This is not immediately obvious, especially to users not providing any
   custom options, and makes it easy to accidentally effectively disable
   caching entirely (if `localhost:11211` is not a memcached server).
   
   Note that rails/rails#40420 added support for
   `$MEMCACHE_SERVERS`, and is slated for release as part of Rails 6.1.
   
   [ci skip]

   

   sambostock committed Oct 21, 2020
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