Chris Muller uploaded a new version of Collections to project Squeak 4.6:
http://source.squeak.org/squeak46/Collections-topa.637.mcz

==================== Summary ====================

Name: Collections-topa.637
Author: topa
Time: 29 June 2015, 3:58:07.48 pm
UUID: 32673ced-9c32-44cf-a95e-0cab2033fd30
Ancestors: Collections-eem.636

Always store Characters as if they had one instance variable with their value, regardless whether they are actually shaped that way.

=============== Diff against Collections-eem.636 ===============

Item was added:
+ ----- Method: Character>>storeDataOn: (in category 'object fileIn') -----
+ storeDataOn: aDataStream
+ 	" Store characters in reference-like way, with value like instvar.
+ 	This is compatible with various Squeak Memory Systems"
+ 
+ 	aDataStream
+ 		beginInstance: self class
+ 		size: 1.
+ 	aDataStream nextPut: self asInteger.!