Multiverse/Multiverse-Core — comment on commit 29360feb4e6b678cb6a821c6a9de96f7049c9c0e
File:  line 0
By dumptruckman:

from http://docs.oracle.com/javase/tutorial/collections/interfaces/collection.html
"Note that Iterator.remove is the only safe way to modify a collection during iteration; the behavior is unspecified if the underlying collection is modified in any other way while the iteration is in progress."
So i guess I should have used an iterator here.