Okay, it sneaked into the ancestry with Collections-pre.818. That's 
actually bad, and should be reverted.

Levente

On Wed, 13 Feb 2019, Levente Uzonyi wrote:

> I thought we agreed not to integrate this. See 
> http://forum.world.st/The-Trunk-Collections-topa-806-mcz-td5084658.html
>
> Levente
>
> On Wed, 13 Feb 2019, commits at source.squeak.org wrote:
>
>> Nicolas Cellier uploaded a new version of Collections to project The Trunk:
>> http://source.squeak.org/trunk/Collections-topa.806.mcz
>>
>> ==================== Summary ====================
>>
>> Name: Collections-topa.806
>> Author: topa
>> Time: 12 September 2018, 3:28:40.687052 pm
>> UUID: 46b95db5-a773-4113-92f0-5ee905404b49
>> Ancestors: Collections-cmm.805
>>
>> Fix separators to include U+00A0 (no break space)
>>
>> Thanks Ron!
>>
>> =============== Diff against Collections-cmm.805 ===============
>>
>> Item was changed:
>>  ----- Method: Character class>>separators (in category 'instance 
> creation') -----
>>  separators
>> + 	"Answer a collection of space-like separator characters.
>> + 	Note that we do not consider spaces in >8bit code points yet.
>> + 	"
>> - 	"Answer a collection of the standard ASCII separator characters."
>> 
>> + 	^ #(9 "tab"
>> - 	^ #(32 "space"
>> - 		13 "cr"
>> - 		9 "tab"
>>  		10 "line feed"
>> + 		12 "form feed"
>> + 		13 "cr"
>> + 		32 "space"
>> + 		160 "non-breaking space, see Unicode Z general category")
>> + 		collect: [:v | Character value: v] as: String
>> + " To be considered:
>> + 16r1680 OGHAM SPACE MARK
>> + 16r2000 EN QUAD
>> + 16r2001 EM QUAD
>> + 16r2002 EN SPACE
>> + 16r2003 EM SPACE
>> + 16r2004 THREE-PER-EM SPACE
>> + 16r2005 FOUR-PER-EM SPACE
>> + 16r2006 SIX-PER-EM SPACE
>> + 16r2007 FIGURE SPACE
>> + 16r2008 PUNCTUATION SPACE
>> + 16r2009 THIN SPACE
>> + 16r200A HAIR SPACE
>> + 16r2028 LINE SEPARATOR
>> + 16r2029 PARAGRAPH SEPARATOR
>> + 16r202F NARROW NO-BREAK SPACE
>> + 16r205F MEDIUM MATHEMATICAL SPACE
>> + 16r3000 IDEOGRAPHIC SPACE
>> + "!
>> - 		12 "form feed")
>> - 		collect: [:v | Character value: v] as: String!
>>
>> Item was changed:
>> + (PackageInfo named: 'Collections') postscript: 'CharacterSet cleanUp: 
> false.'!
>> - (PackageInfo named: 'Collections') postscript: 'Character 
> initializeClassificationTable'!
>
>