I've just discovered the ICU's official listing for an ICU wrapper for
Smalltalk:
https://schrievkrom.wordpress.com/tag/icu/

Listed on
http://site.icu-project.org/related

In turn, it mentions:

ICU: Initial source code for Squeak/Pharo.
http://ss3.gemstone.com/ss/ICU.html
by Marten Feldtmann, Jan van de Sandt

ICU-V2 Unicode support
http://ss3.gemstone.com/ss/ICU-V2.html
also by Marten Feldtmann, Jan van de Sandt

On 9 December 2015 at 00:59, EuanM <euanmee at gmail.com> wrote:
> http://www.unicode.org/reports/tr15/#Stable_Code_Points
> Table 7, the discussion of Ligatures, (which uses the ligature of
> "ffi" as its example)
>
> Every time I think I'm about to grokk this standard, something like
> this crops up.
>
>
>
> On 9 December 2015 at 00:43, Dale Henrichs
> <dale.henrichs at gemtalksystems.com> wrote:
>>
>>
>> On 12/08/2015 04:33 PM, EuanM wrote:
>>>
>>> Reading up http://www.unicode.org/reports/tr15/#Examples
>>>
>>> The Unicode standard seems to require you never to make
>>> aGermanStrasse
>>> equivalent in a sort order to the ligatured version,
>>> aGermanStraße
>>
>> I didn't see anything in the examples related to this ... could you be a bit
>> more specific?
>>
>> Dale