jboner/akka — comment on commit 603a8ed034f0489cb1330e81d1159640b9432e16
File: akka-actor/src/main/scala/akka/actor/Extension.scala line 29
By rkuhn:

Then the scaladoc is misleading: getting the thing loaded multiple times means calling registerExtension multiple times. If you supply the wrong key, you’ll get an exception instead.